A pub owner is shutting up for the night when there is a knock at the door. When he answers, a street bum asks him for a tooth-pick. He gives him the toothpick and the bum goes off.

A few minutes later there is a second knock. When he answers, there is a second bum who also asks for a toothpick. He gets his toothpick and off he goes.

There is a third knock at the door, and a third bum. The landlord says, "Don't tell me, you want a toothpick too". "No, a straw" says the bum.

The landlord gives him a straw but is curious why he wants it, so he asks the bum why he wants a straw and not a toothpick. "Some bloke just threw up outside, but all the good stuff's gone already".
  Back