While Gibson was obviously the biggest star in sight by a mile, Isaacs reports, 'There were no shows of ego at all. If you were making the sandwiches and had a good idea for a scene, you could collaborate. Mel, for instance, did every bit as much work for me off-camera as he did on-camera - big stars don't usually show up for that kind of stuff. He asks everyone on set questions and listens. He sees someone with a bad back, he gives them a massage.' And he plays practical jokes galore, right? Wrong. Isaacs thinks that reputation 'doesn't characterise' Gibson at all. 'If you saw him on set, you'd see him telling these terrible crap jokes, laughing loudly all the time and laughing twice as loud at other people's even worse jokes. But it's all done with a serious intent because acting is play. You have to keep yourself loose and irresponsible and childish, even when you're doing a serious part. When Mel and I have this big fight scene, it's "chop, chop, slash, blow, punch". If you go, "Oh f***, I was meant to head-butt there, sorry can we stop?" they'd probably go, "No problem. We'll just reset those 200 horses and put that building back up and tell those thousand guys to go back over the hill." You can't do that so you have to free yourself of any tension that might cause you to.'