top 10 sheldon/penny episodes | the vegas renormalization

“What were you doing at Penny’s?”
“Well, we had dinner, played some games, and then I spent the night. Oh, and you’ll be happy to know that I now have a much better understanding of ‘friends with benefits’.”

LEONARD: It sounds like you had a great night.
SHELDON: I did. How was yours?
LEONARD: Not bad. I had a lot more fun with Amy than I thought I would.
SHELDON: What exactly do you mean by that?
LEONARD: Well, turns out she really knows how to help a guy loosen up and have a good time. Although, truth be told, my groin’s a little worse for wear. 
SHELDON: [karate chops Leonard]
LEONARD: Ow! Why’d you do that?
SHELDON: To send a message! She is not for you!
LEONARD: What?
SHELDON: Not for you!