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!
SHELDON: Not for you!