You don't want a glimpse of my world. lol.
Here's one though, probably the least crazy.
Take a scalpel, cut the guy's tummy open then cut one of his intestines. Put him on drugs after just not to die, so when he has to take a shit after a hours of being tied up, the shit comes out of his stomach and lastly take sandpaper and keep rubbing it across his face till he has no more face. Probably kill him afterwards, by stabbing motions or let the rats or rabid dogs tear to bits.
I'm a very nice guy in reality though. Seriously, ask anyone I know. lol