Some years ago a member of a forum I used to belong to (I forget which now) spent a great deal of effort trying (unsuccessfully) to persuade AOL to unblock his website in the USA. It had been blocked because one page contained the word "tits" times. He was an ornithologist and the tits in question were members of a species of small bird widespread in the Northern Hemisphere - including N.America, though they are known by other names there.

More info on tits in Wikipedia.