What is your favorite witty comeback or catchphrase?

What do you say in situations where you can make a humorous statement, or a comment or something of that nature? Or, your catchphrase?

I often find myself saying “Gosh”, but I pronounce it like “Gawsh” for some reason.

Do you say something like “Your face” or “Your mom”, for example? I don’t think anyone actually says those things anymore, though.