OMG, this reminds me of a freaking hilarious Garfield comic dealing with comebacks (three boxes):
1st box: Jon's on the phone with a girl, and Garfield is lying down on the table, and Jon goes, "And I wondering if you would go out with me tonight?"
2nd box: Same scene, Jon says, "You say you'd rather go out with camel spittle?" And Garfield goes, "Zap her back! Zap her back!"
3rd box: Jon is lying down in bed later that night with Garfield on top of him. Jon goes, "'But what if you're brother already has plans?' That's what I should have said!" And Garfield goes, "Ol' lightning wit strikes again."
Best Garfield comic ever. I laughed so hard.