Someone who shows up to your door for no reason.
Matt
Monk key
Relaxatives.
A lepercon. (In honor of Saint Patrick's day.)
The mafia doesn't like witnesses.
Dind Dong
To Whom It May Concern
They use a machine gun.
They both need to be changed after a while for the same reason
Dads joke) The same reason 10 pennies is worth more than 9.