Raj: Ooo, big talk from a man who was once treed by a chicken.

Sheldon: Howard, you know me to be a very smart man. Don't you think that if I were wrong, I'd know it?

Wolowitz: Sex is never the way I dreamed it was going to be.
Raj: Because in your dreams, you're a horse from the waist down.

Leonard: Why would you buy peppermint schnapps?
Penny: Because I like peppermint, and it's fun to say schnapps!

Raj: I don't like bugs, okay. They freak me out.
Sheldon: Interesting. You're afraid of insects and women. Ladybugs must render you catatonic.