If you want to see what sheer terror looks like, check out this video of a normal guy going down an Olympic bobsled run in France. There's a camera inside the sled so you see his face and he's freaking out the whole time.

I don't speak French, but I'm willing to bet that some of the words coming out of his mouth are bad words.

The terror starts at :23, and he freaks out when it starts sliding backwards at 1:46.