One time, in the late 1980s, I was on the subway in Buffalo. At one stop, a group of ... uhh, very special people got on the train. The doors closed, and they all sat together. A few seconds after the train started to move, one of the very special boys cut one loose. The sound reverberated loudly off the hard plastic seat, and the group starred to laugh. Another special boy leaned to the side, grunted, and let one go. More laughing. A very special girl stood up, groaned loudly, and let out a very special toot. More laughing. This went on for about five minutes -- very special adolescents propelling naturally generated methane through a Metro Rail car -- until the very special, mentally handi-capable group reached their stop.
A few years ago, I was riding the Colfax Avenue bus in Denver. There was a black man sitting in the front, listing to a Walkman and bobbing his head. Every so often, he'd make a loud utterance. "YEAH, KILL ALL DA WHITE PEOPLE, KNOW WHA' SAYIN?" "HEHE ... KILL WHITEY, UH HUH!" "THAT RIGHT ... WHITE MAN THE DEVIL ... GOTTA' GET EM, UH HUH!" "GONNA' KILL ME A CRACKA, HEHEHE!"
Most of the bus riders were white. There was NOBODY else at the front of the bus but him and the driver.