A few of my friends keep telling me to watch a recent HBO show called Chimp Crazy, which mentions this incident among others. Chimpanzees can pull with roughly 800lbs (~360kg) of force, meaning they can literally rip parts of your body off (which also happened to the victim in the OP). If you’re going to have a pet, probably best to ensure it’s one that isn’t disproportionately stronger than you are. But really, just don’t be a dumbass and keep exotic pets that can easily slaughter you.