This isn't exactly a come back, but I've done this several times when I'm at a bar and some douche fuck decides to start acting up. I don't have much tolerance for arguing back and forth, so I simply take their drink from them and start drinking it. This only leaves them with 2 choices. A, they can either try and take it back which they never do because that means they would have to fight for it. Most people shit themselves when actually forced into a "fight" situation. Or, B, they can bitch up and walk away which does more damage to their pride than any comeback could ever do.