I'd really like to see someone survive getting their head lopped off, have the body sliced and diced into pieces, then have all those pieces and head dumped into molten lava.
On this subject: one immortal that has survived several beheadings is a little fella called wolverine...heard of him?
he has also survived a trip to the core of the sun, been thrown into a black hole (which he described as mildly annoying because of the gravity thing.) he has also been ripped to a thousand and more pieces by; the hulk, Thor the God, superman in a crossover, galactus, the silver surfer and many more.
so to this spesific comment; you should read wolverine, **** like that happens to that fella all the damn time