You can't brush your teeth with a crocodile.
Hillary got off Scott-free.
You can tune a piano but you can't tuna fish "What about the glue " I knew you'd get stuck on that.
Do you swear to pull the tooth, the whole tooth and nothing but the tooth
Gladiator.
When your toothbrush stops working mid brushing
Cause it was invented in Alabama! Inspiration came from the comments(http://mobile.reuters.com/article/idUSKBN0GP1NS20140825 irpc=932)
A Hun knee comb.
An old person can sing and brush their teeth at the same time.
A tacodile
You will lose every hand.