A guy leaves his place at the bar to go have a piss

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?”