A woman goes to the Doctors with a very embarrassing disfigurement.

"Will you promise not to laugh", she asks the Doc.

"I promise" says the Doc. 

So she takes her blouse off and exposes one large ample breast right in the middle of her chest.

To which the Doc burst into fits of laughter.

"I knew you'd laugh, I just knew it ", cried the woman, so she lifted her arm and pissed on him.