The only time I take my foot out of my mouth is to put the other one in.

I was talking to some friends. One of them had a book in their hands. On the front it had one of those 'this is the best book ever' kind of quotes. The person who had said that was someone I had never heard of, so I made some kind of 'oh yes of course you know so and so, him, well if he says its good its worth a read' being all sarcastic. It turns out they did know so and so, one of them used to work with him. Doh!