Leonard announces that the professor who was invited to a trip to see CERN's Large Hadron Collider in Switzerland was unable to go, so he (Leonard) was designated to be the replacement to go to Switzerland, and he gets to take one guest with him. Sheldon assumes that he would be Leonard's guest because they have a roommating agreement that if one roommate gets invited to see the collider, he would invite the other. In spite of the agreement, Leonard chooses to invite Penny, as the trip would coincide with Valentine's Day, their first together as a couple. Sheldon tries to pressure both Leonard and Penny to let him go instead, but Leonard insists on bringing Penny and not Sheldon. The night before their scheduled trip, Penny falls ill, so Sheldon is designated to accompany Leonard. However, Sheldon immediately falls ill too, which he suspects he caught when he hugged Penny a day before. Raj therefore accompanies Leonard, and they arrive in Switzerland to a hotel room stocked with champagne, roses, and chocolates.

Pop Culture Connections - Outgoing

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The Big Bang Theory Season 3

# Title Air Date
The Big Bang Theory
3:1 The Electric Can Opener Fluctuation Sep 21, 2009
3:2 The Jiminy Conjecture Sep 28, 2009
3:3 The Gothowotz Deviation Oct 5, 2009
3:4 The Pirate Solution Oct 12, 2009
3:5 The Creepy Candy Coating Corollary Oct 19, 2009
3:6 The Cornhusker Cortex Nov 2, 2009
3:7 The Guitarist Amplification Nov 9, 2009
3:8 The Adhesive Duck Deficiency Nov 16, 2009
3:9 The Vengeance Formulation Nov 23, 2009
3:10 The Gorilla Experiment Dec 7, 2009
3:11 The Maternal Congruence Dec 14, 2009
3:12 The Psychic Vortex Jan 11, 2010
3:13 The Bozeman Reaction Jan 18, 2010
3:14 The Einstein Approximation Feb 1, 2010
3:15 The Large Hadron Collision Feb 8, 2010
3:16 The Excelsior Acquisition Mar 1, 2010
3:17 The Precious Fragmentation Mar 8, 2010
3:18 The Pants Alternative Mar 22, 2010
3:19 The Wheaton Recurrence Apr 12, 2010
3:20 The Spaghetti Catalyst May 3, 2010
3:21 The Plimpton Stimulation May 10, 2010
3:22 The Staircase Implementation May 17, 2010
3:23 The Lunar Excitation May 24, 2010

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