I don't quite get the Torture Rack. You're just kinda lying over the other dude's shoulders. Maybe if you were lying horizontally across them it could hurt, but whenever I've seen it (admittedly, mainly by Big Zeke), the guy's lying sideways...
I always liked Luger doing it. One of my faves. Zeke always does a weak looking version.
The principle is one hand is around the jaw, one around the leg, and he is yanking down, so essentially trying to pull the head and leg off, thats the basic theory anyway, hence its meant to be...torture...