New Jersey: It is illegal to wear a bullet-proof vest while committing murder.
New York City: Up until 2008, it was illegal to dance at most bars. The bars needed a special "cabaret" license. Back in the 90's, I remember being reprimanded by a bartender for dancing at a bar. He told me and my friends not to dance and pointed to the posted signs, "NO DANCING ALLOWED" or the bar would get in trouble.