a tramp walks into a pub and asks for a toothpick. the barman sees no harm in this and so gives him a toothpick. the tramp then leaves the pub.

a couple of minutes later another tramp enters the bar and asks for a toothpick. the barman obliges and the tramp goes on his way.

the same thing happens three more times in the next 10 minutes. the barman is perplexed. another tramp walks in, this time asking for a straw.

the confused barmans curiosity gets the better of him so he asks "for the last quarter of an hour, tramps have been coming in asking me for toothpicks, then you come in asking for a straw. why?"

the tramp replies "well, someones been sick outside and all the best bits have gone."