A Sick Joke

A tramp shambles into a bar and approaches the bartender.

"Can I help you, sir?"

"Could you give me one of those plastic takeaway forks you have back there?"

The barman warily hands over a fork and the tramp shambles out again.

Another tramp wanders in, asks for exactly the same thing and leaves with a fork as well.

This happens for a third time with yet another tramp.

As a fourth tramp shambles up to the bar, the barman says "Let me guess, you're after a plastic fork?"

"No, I want a straw."

"Why a straw?"

"Someone threw up outside but there's no chunks left."