I know it's not funny but it does make you kind of laugh after you realize everything is ok, doesn't it?
I stopped, looked at her like "Oh no!" and she just rubbed the back of her head and starred at me like "You a-hole, that hurt." but didn't wimper or anything.
Yes, it does make us laugh afterwards when all goes well. I think the laughing comes from the release valve on our stress-o-meter.