What would happen if someone traveled into a black hole?

It is impossible to travel into a black hole, the gravitational pull from what is known as the event horizon, would be sufficient to rip off any body part which crossed it.

However it is not possible to ever reach there, as time slows down as you approach the speed of light, it would take an eternity to reach the event horizon.

you would also become skinny and stretched like spaghetti and your internal organs would be ripped apart.

Also:

If someone was watching you, you would stop, then begin to fade, as a black hole sucks in all light and prevents any light escaping.