Old-fashioned books, old-fashioned rabbit keepers and occasionally even old-fashioned experts sometimes recommend trancing a rabbit by putting it into a state of tonic immobility. Ignore them. A rabbit in a trance is playing possum, ie playing dead, the last desperate gamble of an animal trying to escape a predator. Don’t be tempted to make your rabbit do this. The rabbit looks as if it’s just hypnotised or unconscious to us but the rabbit shows signs of extreme stress throughout. Your rabbit may never come out of the trance. I know of one rabbit that died during trancing. It’s dangerous.