It's an interesting phenomenon in the U.S. They are the land of free speech, which also includes quite a few expletives, things as f*ck, motherf*cker, son of a bitch, etc.... quite nasty stuff, but it's perfectly fine to have that in movies (as long as there is nothing perfectly natural like a pair of naked bewbs....) BUT, there is a word, which certain black people apparantly often use to address each other, but as soon as a white person dares to speak that word, all hell breaks loose.... it's even worse than uttering Voldemort when speaking with wizards. The word begins with N and thus everybody calls it the "n-word"