Presumably a male cat

Once upon a time, in a place not too far from here, there was a cat playing on the railroad tracks. Just then the train came roaring down the tracks towards the cat. The cat in question started running, trying to get out of the way. The train just missed him, taking only a little piece of his tail. The cat however, spun around really fast to see what had happened, and the train took off his head.

What's the moral of the story? Don't lose your head over a piece of tail.