Can someone explain to me what exactly is or was what was commonly referred to as a 'switch' or a 'blackjack'? I might have the names wrong but from what I can gather from old TV series and movies is there was this thing, a somewhat small object usually black, and people would hit people on the head with it? I think I heard it was illegal or something. Why aren't they used any more? I'm fascinated by this object used in movies and TV that is no longer around(I think).