I do this often, and the time it really bothers me is when I think one thing and say something else and don't realize that it happened. Then I just get a "WHAT!?", so usually I'll mumble something about it making sense to me. Maybe I can be a bit egocentric, but sometimes I like to just assume it's because I'm smarter than the people I'm talking to, so that's why it doesn't make sense to them. Makes me feel a little less crazy that way