Sometimes it's dastardly when it just pops up like that, isn't it? I generally just tell it to F*** OFF (I've even accidentally said it out loud...in front of others a few times). The more subtle ones are the ones I acknowledge, look at for a moment and then let flow through me. It is at those times, I will sometimes recognize how my thinking brought that on but most times it just passes through. Sometimes quickly and sometimes not so quickly but either way I know I won't act on it so it's got no power. Annoying? yes. Aggravating? sometimes. but ultimately it has absolutely no power. None.