Well, from a domme's point of view, I've never done anything severely extreme to my sub.
And not going to lie, no offense, but your extreme example creeps me out a little.
I almost feel bad for the OP, we're really belittling her thread here
The most extreme thing... once I had to press myself against a window (that faces a busy street) naked as a punishment. Too bad my room this year is on the ground floor, my window will be hidden behind some bushes =(