*cough* I must confess I've had characters rip apart creatures from inside before. Ever seen the furnace golem from Tome of Horrors II? It's got a really high AC and this nasty attack where it grapples people and tosses them into its furnace-stomach. So it did that to a character of mine, but she was fire-resistant, and there was no crushing or acid damage like in most creature's stomachs. The critter was so big inside it wasn't too hard to swing her sword, and the AC was much, much lower on the inside. When she got out after pulling a inside job can-opening manuever, she said, "I'll have to remember that, things are much easier to kill from the inside!"