The Haitian necklace (necktie?) is a good one... tie their hands to their feet, kneel them in the middle of the street, put an old tire around their head/neck, slosh some gasoline inside the tire, set on fire. You get some good screaming out of that for a while, then some good wiggling and squirming for quite some time.
From the book Sniper about Carlos Hathcock, comes an oldie but goodie from Vietnam. Poke a hole in the bottom of a wicker basket, put victim's head through the hole so it's inside the basket, drop in one rat, sew lid on. The rat won't bite it's way out of the basket until there isn't anything else edible inside the basket, so that can take quite some time to end.
Oh yea, almost forgot... "IN".