okay, i have more and i hate to admit that these are some forms of torture from an actual case similar to Gerard's. I may be repeating some suggested ideas but here you go:
-Forced to masturbate
-Face held against concrete ground and jumped on
-Hands tied to ceiling and body used as a punching bag
-Nose filled with so much blood that he can only breath through his mouth
-Dumbbells dropped onto his stomach
-Flammable liquid poured on his feet and legs, then lit on fire
-Eating human flesh (they could tell him it was his daughter)
-Force heroin or coke into his blood system (so much that in the space of a short time he's dependent on it and when they suddenly take it away he has to go through a horrible detox)
i'm a horrible person but at least i'm helpful :D