The Tangible Affection Proof

The Tangible Affection Proof is the 16th episode of the sixth season of The Big Bang Theory. The episode will air Thursday, February 14, 2013.

Summary
Penny tells Leonard how she saved a man's life by yelling to the busboy that a man was choking. She also tells Leonard that she is free on though she complains that no matter the anticipation, she always ends up disappointed. Leonard tells her that he has that covered. Sheldon and Amy are climbing the stairs with Amy wondering about Valentine's Day; while Sheldon keeps talking about the how their spicy food has affected his toilet habits. Howard mentions that Bernadette is cranky after working long hours. Raj and Stuart decide to throw a Valentine's Day party at the comic book store for those without dates. Alex asks Sheldon when she can help him with his research, while he just wants her to go out and buy Amy a Valentine's Day gift. Howard is creating a micro-present for his wife, but it breaks and Leonard invites them to come to dinner with Penny. At Sheldon's place, Alex shows up with three potential gifts for him to give to Amy. He picks the third which is a painting of a, since she is a neurobiologist. He likes the painting so much that he keeps it. At dinner, Bernadette and Howard show up fighting because Howard didn't wash her clothes. She then hides his. Penny notices a couple she despises (her old boyfriend and the girl that broke them up) as the guy immediately gets down on one knee and proposes. Leonard sees how upset Penny is, so he gets down on one knee, and Penny yells at him to get back in his chair. They continue to argue as Howard and Bernadette feel that their conflict was minor compared to Leonard and Penny's. In apartment 4A, Amy tells Sheldon that her perfect gift for Sheldon is to spend a quiet night at home doing things that he likes. Sheldon then shows Amy that she is down as his emergency contact in his wallet, which Amy loves. At Penny's, Leonard says that he'll stop proposing to her and that when she's ready, she can propose to him. Even after a horrible night, they agree to be each other's valentines. Raj makes a nice speech at the party about them not being alone and being a community together. Then, a girl likes his speech and he leaves with her, leaving everyone else behind. Finally, Amy finds that she is getting a lot of emergency calls about Sheldon since she is his point-of-contact.