There is a wonderful line of dialogue from an old Simpsons episode where Meryl Streep plays a bully in Bart's class that he falls for hard and fast. As he is trying to act cool with her on the playground at school, she asks him -- in a coy, sweet voice, just dripping with cruelty, "Do you ever think anything you don't say?"
That line has kept me in check more than once in my time. Thanks for posting!