You know whats funny, is that there arn't very many all white pitbulls, there are alot more white boxers than there are white pitbulls.
But since they are mostly white with colored spots, I guess people associate that with a pitbull, but I have seen more boxers like that than pits.
:D and if you put your arm in a pitbulls mouth its not going to be like a bear trap :D unless you are doing it to a dog you don't know, and even then it will probably only bite you not latch on. Now if you are in an actual fight with one than they might latch on :D but why would you get into a fight with a dog?
Maybe get into an argument with it about what breed it is LOL!:D