#265: Sheldon shows a greater range of emotion with Penny than he does with anyone else.

#264: Sheldon estimated Penny’s supposed number of past lovers based on observation of her behavior, but did not make any value judgments.

#263: She left Leonard to go comfort Sheldon after they came back from the North Pole.

#262: They’re both “outsiders” who moved to California from Middle America to pursue their respective ambitions.

#261: Penny doesn’t like it when Leonard gets too clingy and needy. Sheldon wouldn’t demand as much from her emotionally, and she’s already sung “Soft Kitty” enough times to prove she deals with Sheldon’s rare neediness better than she deals with Leonard’s.

#260: He genuinely tried to teach her physics despite hating teaching in general.

#259: Sheldon freely asked Penny out for a night of dining and dancing. When Amy wants boyfriend/girlfriend time, she has to invoke the Relationship Agreement, and Sheldon desperately seeks a way out of fulfilling his “contractual obligation” to her. Conclusion: Sheldon would willingly subject himself to bf/gf activities with Penny (even if it’s supposedly only to make Amy jealous), but literally has to be forced to do them with Amy.

#258: Both are stuck in relationships they don’t really feel comfortable in.

#257: Their babies would be even smarter and more beautiful. And real.

#256: Her spot in the opening credits will always be next to him.

#255: They are like an old married couple… and Sheldon expected so much of that marriage!

#254: “Penny is gone, she already left.” “She couldn’t say goodbye?”

#253: It’s already been proven for years in Lanford that Leonard and Leslie are fated to be together. Meanwhile, the most used promo is of Penny and Sheldon and no one else. The TV has spoken.

#252: “That was fun. Do you want to go to one of those big warehouse stores tomorrow? We’re still on for put-put golf though, right?”

#251: Their relationship is a fascinating paradox. It makes both characters blossom.