A man is drinking at a pub. After a few rounds, he gets up to leave, explaining to the bartender that he needs to go home to use the toilet.
"Don't be stupid," says the bartender. "We've got a perfectly good toilet here!"
"Yes," explains the drinker, "but I take salts."
"So what? That doesn't matter. You can still use the toilet here!"
The drinker reluctantly agrees and heads for the toilet.
After a few moments, there is a loud banging noise, and the man emerges, followed by a foul smell.
The bartender races into the toilet and sees mess all over the ceiling and walls. He rushes back into the bar.
"What the hell went on in there?!" he demands.
"I told you," explained the drinker.
"No, you said that you take salts!" yelled the bartender.
"That's right," the drinker shrugs, "somersaults."