A Jehovah's Witness.
They ain't private ears. (I don't care if a six year old came to this first thirty years ago, it just came to me.)
It has huge balls on it. Credit goes to the 70 year old man who just came into my work and made my day.
Because they don't like random people knocking on their doors
Nobody asks, 'who's there ' when you try and tell a knock knock joke.
The mafia doesn't like witnesses.
Because freedom rings.
