Not generally, no.
Its not dangerous.
call 911
biting someone
Perhaps, but there are simpler reasons that are medically proven. A paranormal explanation would be indistinguishable from pure coincidence.
I don't believe so...
You don't have to... but I am hoping that should you be at sea and see someone having trouble that you would indeed, atleast alert someone within ear shot whom is capable of saving the person in trouble.
Yes.
Of course not. It has the same effects if you swallowed your own hair!
you could. it's called aiding and abetting
When you are in trouble or a sticky situation. (And it's you're by the way)
Not medically although they may suffer from bullying if caught.
he would over react and try to blame someone else for it