Jeff M. left his pet iguana with me while he was on vacation. (Jeff doesn't currently have an iguana.) It would hop up on the bed in the mornings and grip my elbow in its teeth, and begin tugging in an attempt to pull me off the bed. I think it was trying to drag me somewhere else to eat me. But the dumb thing had NO idea that I outweighed it by 150 pounds. It would just keep tugging and tugging until I hit it with a pillow, then it would run away. It always came back eventually, though.