Because he never pays his debts.
or
Do you swear to pull the tooth, the whole tooth and nothing but the tooth?
or
Bike helmets don't fit hippos
or
I think I'm coming down with something!
or
Can I have your hand, hand, hand, hand, hand, hand, hand, hand in marriage?
or
1,622. One to tell the original joke, and the rest to submit give some minor variation of it! For example:
or
Anywhere it wants to
or