A drunk gets up from the bar and heads for the bathroom.
A few minutes later, a loud, blood curdling scream is heard from the bathroom.
A few minutes after that, another loud scream reverberates through the bar.
“I’m just sitting here on the toilet and every time I try to flush, Some thing comes up and squeezes the hell out of my balls.”
With that, the bartender opens the door, looks in and says: “You idiot. You’re sitting on the mop bucket!”.