If someone tries to hang you : first, bend your knees, try to let your weight rest in the noose, don't support yourself with your legs. Death by hanging is caused by the sudden jerk breaking the neck, not strangulation. Now, when they kick out the chair or open the trap-door, you have already got your weight in the noose, and you should be able to ease into the hang. Try to get a big breath of air right before they do it. Now, make a strangling noise and twitch a bit, then twitch your fit, then be perfectly still and play dead. Hopefully now they'll assume you're dead and either A) cut you down, or B) leave. If they leave, pull yourself up the rope with your arms. Once you have some slack, wrap your left arm in the rope tightly so you can hang your weight on it without using your muscles. Pull the noose with your right arm to get some slack into it so you can slip out.