Four letters: K, C, U, F. Put it together, kcuf. Nothing bad about those four letters that way. But, when you reverse the same four uninteresting letters, people start to plug their ears...people start to complain...lawsuits are filed...media companies sued...movies get their ratings changed from PG-13 to R. Four letters. There is some silly about our society when four letters can make so many people fucking riled up (whoops, did I use the four letters "inappropriately"?).