Assuming they do not need to be dangerous or unhealthy to be dumb, I take a favorite from my father in law. I the late 40's as a high school student in Chicago, he along with some buddy's choose to skip school. They where promptly pick up by the police and taken to the station for being truant, when taken before whomever they took "little thugs" (his word not mine) they where asked why they did not have to be in school, and my FIL answered "we are Jewish, and today is a holiday... so we get the day off". In reply one of the officers announced that in fact it was a Jewish holiday, as he knew a family down the street from him, that was Jewish and in fact they where having a big get togather.
The powers that be pointed out that the boys really should be with their families for a holiday but they where free to head home.... As he headed to the door one of the police officers asked him did he know him, and what was his name again. My FIL answered truthfully Richard A. Kaiser, but we never use the A. because it stands for Adolph.....