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Nightmare Fuel: Deep Impact
When a fissure in the asteroid expels a forceful plume of gas that pushes Jon Favreau up and back, so quickly that he flies off the ground and begins to float away. The idea of just floating, with no control over your course or speed, unable to see what you are heading toward, watching solid ground fade into the distance, and just waiting to die, still terrifies. The only saving grace is that the sun, when it rises, will most likely kill him—though first he'll have to watch it rise, until it is bright enough to blind him, and then he'll cook relatively slowly, rather than be immediately vaporized.
Except that the sun won't vaporise him, nor cook him. Remember, they're still near Earth. Astronauts are exposed to the sun all the time. The only reason he got sunburned and blinded was because his face-shield was still up, leading to rapid exposure of immense solar radiation. He's dead, sure, but it'll likely be due to running out of oxygen first, rather than being slow-cooked.
Yes, definitely. I love over-the-top disaster movies and seeing cities utterly destroyed is just mindless fun—but his fate in that movie horrified me.
I'll be honest; seeing that meteorite crash into the Earth and HUGE MEGATSUNAMIS destroying everything scared the utter hell out of me when I was younger, and to this day I'm still paranoid about possible catastrophic meteorite impacts.
See, the most horrifying aspect of this (to me, at least) was wondering how long he would wait before taking the Tim Robbins from Mission to Mars option and removing his own helmet and dying from exposure to the vacuum of space.