The Big Bang Theory

The Bath Item Gift Hypothesis

792pages on
this wiki
The Bath Item Gift Hypothesis
Bath item gift hypothesis 2
The Big Bang Theory episode
Season 2, Episode 11
December 15, 2008
Guest star(s)
Episode guide

"The Vartabedian Conundrum"

"The Killer Robot Instability"
Season guide

Season 2

Season 3

"The Bath Item Hypothesis" is the eleventh episode of the second season of the American sitcom The Big Bang Theory. This episode first aired on Monday, December 15, 2008.


Sheldon undergoes obsessive preparation to exchange Christmas presents with Penny, who's Christmas gift to Sheldon goes beyond Sheldon's wildest dreams. Penny starts dating a handsome physicist. 

Extended PlotEdit


Leonard and Penny over egg nog.

Wizard physicist and all around hunk David Underhill starts working with Leonard. While eating lunch at the Caltech cafeteria, the topic of discussion was how does Superman keep his uniform clean? The first proposal is that he flies through our yellow sun. What if it is indestructible Kryptonian mustard or Kryptonian sweat from a tether ball game in the miniature Kryptonian city of Kandor? Luckily they hypothesize that there is a handy Kandorian dry cleaners nearby. Enter the recent winner of the Macarthur Genius Grant: David Underhill whose work in galactic dark matter invalidated most of Leonard’s work. David is quite good looking and Raj develops a crush on him. David ask a favor of Leonard to work with him on a project. Leonard agrees enthusiastically.

Skärmavbild 2013-12-19 kl. 18.02.29

Sheldon is annoyed because Penny bought him a Christmas present.

Leonard arrives at the apartment, missing Wii Bowling Night. Dave is very cool, as he is a Black Diamond (advanced) skier, collects vintage motorcycles, and does a spot-on impression of Stephen Hawking having phone sex. Dave and Leonard are getting along very well and are going to the gym in the morning. Penny asks if the guys are putting up a Christmas tree to which Sheldon explains. "We do not celebrate the ancient pagan ritual of Saturnalia. Sheldon explains, "In the pre-Christian era, as the winter solstice approached and the plants died, pagans brought evergreen boughs into their homes as an act of sympathetic magic to guard the plants and preserve their essences until spring. This custom was later appropriated by northern Europeans and eventually becomes the so-called Christmas tree." Howard quips "And that, Charlie Brown, is what boredom is all about."

Penny says that she'll put their presents under her tree. Sheldon is upset, stating that Penny is not giving him a present, rather an obligation. He must give her something of equal value based upon on her present and her perceived level of friendship. Raj and Howard end up taking him to the mall.

Leonard and David are heading up the stairs helping Leonard after the motorcycle fell over on his leg. They run into Penny who is surprised that David is a physicist and they became quickly smitten with each other. Penny claims to be a geek who would love to see his science lab. David proposes to take her out to dinner and up the coast on his bike. Leonard is left on his own to figure out what just happened.

Sheldon's shopping does not go well in a bath & body shop which is a "cacophonous assault of eucalyptus, bayberry, cinnamon, and vanilla." To be fair, though, it is less scary than the Build-A-Bear shop next door. Howard picks a gift basket to purchase, but Sheldon stops him. He has no knowledge of what size gift basket to get. He experiments by "giving" the gift basket to the sales clerk. Since she acts just like Penny, Howard claims that they'll take it.

Sheldon's gifts

Sheldon's bath gifts.

Leonard gets a little shock in the university's cafeteria finding Penny with David and having taken his offer of looking around the labs even though he had also offered to show Penny around. David is totally into Penny, saying she has an agile mind (among other things) and he has forgotten about working with Leonard. He is more interesting in doing some research with Penny about the effects of tequila shots on a gorgeous 22-year-old woman.

Back at the apartment, Leonard is upset and lying on the couch when Raj and Howard enter carrying several huge gift baskets. Sheldon's plan is to open Penny's gift first, then excuse himself with some "gastric trouble," and get the appropriately-priced basket, returning the others later. Howard wonders if Leonard has already gotten Penny the perfect gift; a new boyfriend.


Sheldon giving Penny a hug.

Leonard goes over to Penny’s finding her drinking rum and eggnog minus the eggnog. He demands an answer to why Penny is suddenly dating someone smarter than himself when she thought he was too smart for her, the very thing that broke them up at the beginning of the season. Penny bursts into tears wondering why he was yelling at her. Leonard immediately retreats and tries to find out what's wrong. She says that David is an idiot because he should have taken the nude photos of his wife off his cell phone before taking nude photos of his girlfriend. Leonard asked about the nude pictures to which Penny responded, “THAT'S what you got from that? The guy is married!" Penny also asks that if he is 'perfectly happy' with the way things are, then why is he jealous. Leonard apologizes and asks her to give him this one since it is Christmas. They end up cuddling. She relents and wishes him a Merry Christmas. Then Leonard brings up that his leg is still in pain.

Later Penny brings over her Christmas presents. Sheldon gets a napkin, which when turned over was signed by Leonard Nimoy. "To Sheldon, Live Long and Prosper." First he is speechless and then Penny apologizes that it is dirty because he wiped his mouth on it. Completely overwhelmed and emotional, Sheldon then exclaims that he now has the DNA of Leonard Nimoy and can grow a (clone) of his own before quickly running off to his room. Leonard gives Penny a set of children’s science experiments because she told David she was so into science. Leonard gets some motorcycle lessons to prevent any future accidents. Sheldon returns to the room with all of the gift baskets he bought and gives them to Penny, much to her surprise. However, thinking that it still doesn't equal the value of his gift, Sheldon gives Penny something he rarely gives anyone... a hug. Leonard considers this day is a Saturnalia miracle (i.e. Sheldon version of a Christmas miracle.)_.


  • "As a Christmas episode this definitely contains the feel good factor, but more than that it is the best episode this season. Combining character development and humor in a blend which this show can do really well." - The TV Critic's Review
  • IMDb user reviews.


  • Jim-parsons-sheldon-cooper-leonard-nimoy-live-long-and-prosper

    Leonard Nimoy's napkin.

    Title Reference:
    The title refers to Sheldon's present and strategy for his Christmas present to Penny.
  • Chuck Lorre's vanity card [1]
  • This episode was watched by 11.42 million people with a rating of 4.1 (adults 18-49).

Costume NotesEdit

S02e11 wildlife

unknown wildlife sanctuary shirt

  • Leonard wears the "Fly Lower" shirt from Urban Outfitters (looks like a tree with root system - it's discontinued), a red periodic table shirt, a black tee with a squirrel from an unidentified wildlife sanctuary, and unidentified fish shirt, and his yellow APS t-shirt .

Set NotesEdit

Several Superman comics can be seen on the coffee table, including:

S02e11 superman mos 9

Superman: Man of Steel #9 (March 1992)

Superman: Man of Steel

Issue #9

"Power Breakfast"

March 1992


Issue #65

"Head Man"

March 1992

S02e11 superman65

Superman #65 (March 1992)


Penny: Hey Sheldon, are you and Leonard putting up a Christmas tree?
Sheldon Cooper: No, because we don't celebrate the ancient pagan festival of Saturnalia.
Penny: Saturnalia?
Howard Wolowitz: Gather round, kids, it's time for Sheldon's beloved Christmas special.
Sheldon Cooper: In the pre-Christian era, as the winter solstice approached and the plants died, pagans brought evergreen boughs into their homes as an act of sympathetic magic, intended to guard the life essences of the plants until spring. This custom was later appropriated by Northern Europeans and eventually it becomes the so-called Christmas tree.
Howard Wolowitz: And that, Charlie Brown, is what boredom is all about.

Penny: Dave is not smarter than you. He's an idiot.
Leonard Hofstadter: Really? (smiling) Why would you say that?
Penny: Because a smart guy takes the nude photos of his wife off his cell phone before he tries to take nude photos of his girlfriend.
Leonard Hofstadter: He tried to take nude photos of you?
Penny: That's what you took from that?!!

Sheldon Cooper: (after opening Penny's gift) Oh... a napkin...
Penny: Turn it over.
(he does, and is so shocked that he has to grab the chair to keep from falling over)
Sheldon Cooper: "To Sheldon, live long and prosper... Leonard Nimoy."
Penny: Yeah, he came into the restaurant. Sorry the napkin's dirty. He wiped his mouth with it.
(Sheldon stands up quickly, shocked again)
Sheldon Cooper: I possess the DNA of Leonard Nimoy?!
Penny: Well... yeah, yeah, I guess. But look, he signed it!
Sheldon Cooper: (very excited) Do you realize what this means? All I need is a healthy ovum and I can grow my own Leonard Nimoy!
Penny: Okay, all I'm giving you is the napkin, Sheldon.

Penny: (after getting several gift baskets) Sheldon, what did you do?
Sheldon Cooper: (worried) I know! It's not enough, is it? Here...
(he slowly and awkwardly hugs Penny, who is completely shocked)
Penny: Leonard, look! Sheldon's hugging me!
Leonard Hofstadter: It's a Saturnalia miracle!



Sheldon gets a napkin signed by Spock02:00

Sheldon gets a napkin signed by Spock


  • Sheldon holding his gift from Penny.
  • Sheldon, Raj and Howard choosing out gift items.
  • A long hug.
  • Leonard's reaction.
  • Penny's reaction.
  • Sheldon's hug.
  • Sheldon's hug.
  • Sheldon hugging Penny.
  • Penny giving Sheldon her gift.
  • Sheldon wanting to give Penny more in return.
  • I know! It's not enough.
  • Sheldon is hugging me.
  • Buying Penny's gift.
  • Bringing in Penny's gifts.
  • Christmas at the Caltech cafeteria.
  • Here's a hug.
  • Talking about her married boyfriend.
  • And the first lesson is not having the motorcycle fall over on you.
  • Here you are.
  • Leonard Nimoy!
  • Sheldon and depressed Leonard.
  • Leonard checking on Penny.
  • Sheldon's hug.
  • Adding a little more rum to an empty eggnog container.
  • Chuck Lorre Productions, #233.
  • Penny is smitten with David Underhill.
  • Drowning her sorrow.
  • Leonard in pain on the couch

Around Wikia's network

Random Wiki