A boomerang
A: A pachydermatologist.
because there were "Too Many Cooks".
By the time you hear it, it's too late to do anything about it. A long list of viola jokes:
They both like bombs
A Meringue-u-tang!!! Note: I know it's spelled Orangutan. :P
A smell that keeps coming back!
A: A nasty smell that you can't get rid of.