Speaking of the Weather

Why is it that whenever you're talking to a member of the opposite sex you fancy, and this won't happen when you're talking to your boy/girl-friend, you almost always end up discussing the weather? I really try not to talk about it, make a conscious attempt too, but it always creeps in. Like the dampness that always seems to surround you in Bombay. It's quite freaky. No more weather talk. None. At. All.