When I think of torture devices, my mind flashes back to Mel Brooks singing about The Inquisition in The History of the World, Part I.
Others might focus on Italian horror films from the 1960s, where a spike piercing an eyeball seemed to be a favorite pastime. However, no matter how stout your character, or how un-squeamish you think you are, I dare you to watch this video and not squirm. There's nothing evil at work, though, just the clever use of a small device to help with ingrown toenails (and we all know how painful those little buggers are).