A guy leaves his place at the bar to go have a piss. He comes back about 10 Minutes later, sits down at the bar, muttering & swearing very softly. The barkeep approaches the customer and asks what the problem is.

"Oh some son-uv-a-bitch snuck up behind me while I was at the urinal and put a gun to my head".

"Jesus Christ! What happened?"

"He told me to give him a blow job or he'd blow my brains out!"

"Yeah, then what?"
"Well you didn't hear a gun shot, did you?"