Death by stabbing a syringe through both eyes then pulling the eyes out and cutting the blood vessel with(yep, you guessed it) another rusty serrated knife. I'd then punch your mouth until either the jaw crumbles in my fingers or all the teeth are knocked out. If the former happens first I'd rip your jaw out, if the latter happens I'll cut your heart open and put all the teeth in your heart.
Why the hell not?