Quote from Kramer in The Strike
Gwen: Kramer, hi. Kramer: Oh, hello. Gwen: It's Gwen. We met at the coffee shop. Kramer: Uh-huh? Gwen: I'm dating your friend, Jerry. Kramer: Ah, I don't know who you really are, but I've seen Jerry's girlfriend, and she's not you. You're much better looking and like, a foot taller. Gwen: That's why we're always hiding in that coffee shop! He's afraid of getting caught. Kramer: Oh, he's a tomcat.