[curryst]

My mental image of a steamroller is slow, so they're dodgeable. I don't think I've ever seen one in real life, come to think of it, so maybe that's just me.

I would have called it "Russian roulette". High reward, high chance of an unavoidable catastrophic loss.

[Skunkleton]

Yep, that is the point. Usually, there is no problem picking up the nickles. Every once in a while, you trip, bonk your head, pass out, then do your best impression of a sheet of paper.