Easy to start: 1.) Find a minimum of at least 2 Bums.
2.)Go tell Bum #1 that Bum #2 was the guy responsible for putting him on the street and that he stole the last little bit of Thunderbird, and his last cigarette filter, you know, the one that has 3 to 4 grains of tobacco on it.
3.)Sit back and watch the crust chip away as they come out swingin'.
Sometimes it'll work when you walk through Grand Central Station and drop a dollar in change in front of a gaggle of Bum.
I Got filthy when I started a couple of Bum Fights and their crust was flying!