Answer:
You can do this with your friends. You can do this with your nose. But don't do it with your friend's nose!
What can you lose that will cause other people to lose theirs too?
Which one of Santa's reindeer can be seen on Valentines day?
When will water stop running down hill?
What has a head and a tail but no body?
I am a room that has a roof but no walls. What am I?