I was on youtube watching video's of the worst crashes in motorsport and I think this has to be the worst. A track marshall ran across the track to put out a fire and was struck at 170 mph by an F1 car. The result was horrific mutilation which very few of us can stomach, yes i'm talking dead space violence but in real life. for some reason i think graphic video game and movie gore has made me immune to real life gore, either that or i must be a nutter.
Needless to say this is an 18 rated video for a reason, if you feel you are unable to watch a guy being rotated like a ragdoll and virtually sliced in half then i'd advise you not to watch.
EDIT: Removed the link because it really is that bad and it appears that some people are sickened. If you want to watch the video then just go to youtube and type in "Tom Pryce" and the video that comes up saying "the most terrible formula 1 crash ever, fatal and worst accident" is the video I'm talking about.