A drunk gets up from the bar and heads for the men’s toilet.
A few minutes later, a loud, blood-curdling scream is heard coming from that vicinity.
A few minutes after that, another loud scream reverberates through the bar.
The bartender goes to investigate what the drunk is screaming about.
“What's all the screaming about in there? You're scaring my customers!”
The drunk said “I'm just sitting here on the toilet and every time I try to flush, something comes up and squeezes the hell out of my balls.”
With that, the bartender opens the door, looks in and says, “You're sitting on the mop bucket!!!”