(She kisses him full on the lips.) Because I'm allergic to peanuts. Friends give each other presents. Howard: Did someone say party? Howard: Don't yell at me, I've got to go to the emergency room. Howard: I suppose that's possible, but for the record, I've never had a threesome and yet I still know I want one. Howard: No, listen, see we're throwing my friend a surprise party and I'm supposed to keep him out of his apartment for two hours. Howard: No, see, the only way I could get him to leave is to tell him I ate a peanut. Leonard: Excuse me, my friend is having an allergic reaction to peanuts. Leonard: Not if you believe his doctors. Leonard: Yes he is. Nurse: No he's not. Penny (with Sheldon in background at the head of a large queue of customers): Yeah, well so do I, look you've got to stall Leonard a little longer. Penny: Nevertheless we are....
Sheldon: In addition I really don't think that Leonard wants a...
Penny: Okay, here's the deal, you either help me throw Leonard a birthday party or, so help me God, I will go into your bedroom and I will unbag all of your most valuable mint condition comic books. Reaches into back pocket, finds the half a granola bar from earlier. Scene: Leonard is exiting the apartment. Scene: The hospital. Sheldon (to customer): Good luck. Sheldon is on the in-store computer. Sheldon: Question, how am I going to get Leonard a present before the party?
Plan: A: Penny; Q: Who decides to throw Leonard a surprise birthday party? A: his parents; Q: Who did not believe in celebrating anything other than achievements? A: Sheldon; Q: Who did Penny blackmail to join in on Leonard's birthday party? A: his mint condition comic books; Q: What does Penny threaten to draw a smiley face on? A: a present; Q: What does Sheldon forget to buy for Leonard's birthday? A: Howard; Q: Who pretends to eat a peanut bar to keep Leonard out of his apartment? A: the emergency room; Q: Where does Leonard drive Howard to after he eats a peanut bar? A: focus; Q: What does Sheldon lack at the computer store? A: the hospital; Q: Where did Howard and Leonard spend several hours after Leonard's allergic reaction? Summary: Penny learns that Leonard has never had a birthday party, as his parents did not believe in celebrating anything other than achievements. She decides to throw him a surprise party, and blackmails Sheldon to join in by threatening to draw a smiley face on each of his mint condition comic books. However, on the day of the party, Penny discovers Sheldon has not yet bought a present, so she has to drive him to a computer store to buy one. Meanwhile, Howard has the task of keeping Leonard out of his apartment before the party. Howard pretends to eat a peanut bar, to which he is allergic, so that Leonard will drive him to the emergency room. However, Sheldon's lack of focus at the computer store means Howard has to distract Leonard even longer, and he eventually actually eats the peanut bar, swelling up in a severe allergic reaction. After several hours at the hospital, Howard and Leonard arrive back at the apartment to find the party has ended, though Penny does kiss Leonard.