Toothpick

A bum walks into a bar and asks for a toothpick so the bartender gives him a toothpick.
Another bum walks into the same bar and asks for a toothpick to so the bartender gives him a toothpick.
A third bum goes into that same bar and asks for a straw so the bartender gives him a straw and asks :
- Why don't you want a toothpick like all the other bums ?
The bums says :
- Well.. a guy puked out in the ally and the other bums got all of the good stuff.