Burn them with a meth pipe over and over, then stick the stem in their pee hole and start kicking/stomping on it as hard as you can, , then pour lemon juice all over it and tie them over some sharply cut bamboo so that it slowly grows through their torso as they lay there dying a slow agonizing death with a recording of whatever annoys them most or reminds them of what got them in that situation to begin with on loop.
There was this movie. I forget it's name. They had this device that a user would wear. It was kinda like a camera. But would also capture and transmit emotions, fear, love, joy. Some people got addicted to the device, and people would use it for porn and all sorts of crazy shit.
Well, this guy killed a girl. Before he did so, he put the helmet device on her. Then a transmitter on himself. As he killed the girl, she could feel the excitement the killer was feeling as he was killing her.