Marcio Stambowsky (one of the famous five to receive his black belt from the legendary Rolls Gracie) shows some of his invisible jiujitsu. (there is quite a bit covered here: wrist lock, sweep, arm bar from mount, etc) If you are ever in the Norwalk CT area I'd highly recommend checking Marcio out as his jiujitsu is off the hook and he is an amazingly cool guy.