A truly horrible way to die would be more emotional than painful. Having to watch everything dear to you die slowly and painfuly whilst you sit there unable to do anything, and then slowly dieng yourself, in any manner, for you would have already suffered great pain.
well id say something slow and painful cause if u get shot in the head its instantaneous and painless i would say the worst way to die would be some kind of flesh eating virus which devours u from the inside out
horrible way to die: being really ill, then try to suicide by using dormicum (or something like that) only because you can't get euthanasia, and then not using enough, and then get into an awake coma, and then have a horrible few last weeks.
I would also say dropping from a airplane or jet several hundred thousand feet in the air. Worse thing is, is that you know you're going to die but you have to wait 'till you drop all the way down.
Or being crushed by walls going 0.01 inch per hour. Or being shoved on top of a grill. Or one of those flat grills at the Japanese restaurants. Or by being forced to watch horror movies for 3 straight days until you eventually die of thirst, for the only food you got was popcorn.