Backdoor Man wrote...
looking down the barrel of a gun (wondering if I'd see the spark when it's fired)
getting my ear sawed off
getting my skin ripped off
getting my eyes pulled out
having my wiener cut off with a dull knife
limbs cut off with a rotary saw
set on fire or being boiled alive
etc.
... You've really thought this through, huh?
Personally, as simplistic as it may seem, my greatest fear is probably living a lonely and boring life