Someone says something and I think of a personal yet witty response. Oh wait, that could be misconstrued the wrong way. Okay, I'll tone it down somehow. Wait, that's not going to say what I mean to say at all. What about this? No, that makes me sound like a creep. Ack! I don't know what to say that won't end up very badly. I'll just say nothing then.
That other someone: I just said something to him and he totally ignored me. What an a-hole!