You Won't Believe It

Ok, yawning is contagious. you wouldn't believe it, but it is. Even thinking about yawning is enough  to yawn. In fact, I bet 50% of you will yawn or already yawned. I'm yawning right now. When one person in a group yawns, the rest will yawn within 5 minutes or be tempted to yawn. I'm still yawning.