What is the worst disaster you have personally experienced?

Saw a guy die when he dumped his motorcycle at high-speed and slid under a parked car, me and about 20 other guys picked up the car and moved it aside because we didn't dare try to drag him out from underneath..

Saw a small pickup truck rear end a tractor trailer doing about seventy miles an hour, the steel bumper of the trailer was in the windshield, he died on impact..

Saw a teenager moments after he got hit by a train trying to beat it across the tracks .
His entrails were hanging out of his mouth, his chest was crushed..