ok some more choices (because i couldn't fit them) if it's one of these select other and copy it into your post...

being given only straight liquor, until you die of alcohol poisoning
throw them from a plane (not too much pain involved but tons of fear....)
shock treatment (chinesse style)
being put in a solid cell with a cannibal
pelted with rocks
burried in the ground to the neck, and then jumping on a lawn mower (i'm sure youc an get where tha'ts going)