- When Leonard is offered a trip to Switzerland on Valentine's Day to visit the CERN laboratory, Sheldon uses any and all means to be his guest instead of Penny.
- Valentine's Day is approaching. Leonard thinks he's hit some good luck in that he has been asked to attend a conference and view the Hadron super collider in Switzerland during Valentine's. He's allowed to bring a guest with him which he has chosen to be Penny. There, the two can have a romantic first Valentine's Day together. This decision doesn't sit well with Sheldon who has always dreamed of seeing the collider. Sheldon does whatever he can to make Leonard change his mind, including reminding him of their documented roommate agreement. But the harder Sheldon tries to convince Leonard to change his mind, the more Leonard seems to resist. But outside forces may end up deciding for Leonard who will accompany him to Switzerland.—Huggo
- It's nearly Valentine's Day, and Howard is excited to announce his plans since he has a girlfriend. Sheldon wonders why Howard would celebrates a 3rd-century saint who was stoned and beheaded. That still beats Raj who is spending his night with a rotisserie chicken. Leonard has been invited to Switzerland to observe the Large Hadron Collider at the CERN Laboratory and is taking Penny as his "Plus One". Sheldon is beyond ecstatic, so much so that he didn't bother questioning why Leonard would get such an honor. Sheldon is assuming that Leonard will take him since Penny has no interest in subatomic particle research while Leonard has been dreaming of spending Valentine's Day with a girl since he was 6.
Leonard has assembled for Penny clues on where they're going, but apparently the Swiss Cheese cut by the Swiss Army Knife and the fondue set aren't enough. She is not excited about the CERN Lab Super Collider in Switzerland, but she is excited about going to ski in Switzerland. And then Sheldon whips out their Roommate agreement. There is a clause stating one roommate must take the other if one of them gets invited to the CERN Supercollider. It doesn't contain any clauses about girlfriends because that seemed too far-fetched when the contract was signed.
Sheldon says that he has always lived up to his part of the roommate agreement including asking how Leonard is doing at least once a day, not staging mock biohazard drills after 10 P.M. and not practicing Tuvan throat singing which he demonstrates. To Sheldon, Leonard is a bigger traitor than Judas, who did hang himself, Darth Vader, Benedict Arnold, and Rupert Murdoch, who owns Fox network, the network that canceled "Firefly."
In the morning, Sheldon makes Frodo-shaped pancakes and serves Leonard in bed and suggesting they watch "Babylon 5" with director's commentary, even though he hates it. Leonard doesn't change his mind so Sheldon takes the pancakes away.
Sheldon then approaches Penny. In the laundry room, Penny is shown a PowerPoint presentation for her about why he is the more appropriate choice to go. He has images of himself and Penny, and of the Super Collider and Bath & Body Works. She has to match the person to where they should be. Penny tells him that it's Leonard's decision and he chose her. Sheldon walks away telling her that it's his dream to go and then she says she'll talk to Leonard. Sheldon thanks her, and even hugs her while asking her when to stop.
Leonard is angry that he went to Penny behind his back and says Sheldon isn't going, even admitting if Penny didn't exist, he'd go alone rather than take him. Thus ends the "friendship clause" in their roommate agreement and Sheldon will never take Leonard as his guest when Bill Gates invites him to go swimming. The morning they are leaving, Penny catches the flu. Now Sheldon can go, and he'll pack as soon as he's done vomiting.
Sheldon is perplexed on how he got the flu...until he remembered he hugged Penny. She made him sick and they end up taking care of each other spending Valentine's Day together. In Switzerland, Leonard and Raj get a beautiful room. The chocolates and the champagne Leonard bought for Penny make the day for Raj the best Valentine's Day ever!
Title reference: The dispute between Leonard and Sheldon over who gets to be Leonard's guest for the trip to the Large Hadron Collider.
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