A drunk gets up from the bar and heads for the bathroom.

A few minutes later, a loud, blood-curdling scream is heard
minutes after that, another loud scream reverberates through
the bar.

The bartender goes into the bathroom to investigate why the
drunk is screaming. "What's all the screaming in there?
You're scaring the customers!"

"I'm just sitting here on the toilet and every time I try to
flush, something comes up and squeezes my testicles.

With that, the bartender opens the door, looks in and says,
"You Idiot! You're sitting on the mop bucket!"