My wife has an annoying habit of asking questions that I couldn't possibly know the answer to. OK, I know she's just thinking out loud, but she speaks in the same tone of voice she uses when she is asking a serious question, and expects an answer. This usually causes me a moment of confusion while I try to think of something intelligent to say.

Once we popped a video in the VCR, the movie started to play, and it was in the letterbox format. Neither of us had ever seen this movie before. My wife asked "Is the whole movie going to be like this?"

Once upon a time, I would have replied "How the hell would I know?" but this time I was inspired to say, "Well, the last time I talked to Roger Ebert, he told me it's only letterbox during the opening credits, and then it switches to full-screen."

(It was total bullshit, but as it turned out, I happened to be right!)

This evolved into a formula. Whenever she asks a question and I have no idea what the correct answer is, I reply "Well, the last time I spoke to [insert name of a famous expert] he told me [insert a bullshit answer]."

It's a lot more fun than arguing.