I had better start stocking up on tobacco now..my plan is just to climb up into a tree and wait it out!
Seriously though, the article alleges that it was due to a 'cocaine psychosis' but it sounds more like he was on PCP. Which the user often times will get naked because they get really hot, and i've heard numerous accounts of people on PCP doing very disturbing things, mutilating themselves, etc. but never eating another person face.