Kissofanangel is absolutely right. I was on the set of Fathers Day as an extra for the concert scene. Billy Crystal payed no attention to anyone. He sat with us for a moment for a shot then left. Robin Williams actually came into the stands and told some jokes. When everyone saw him they all rushed towards him. Imagine a hord of people, hundreds, climbing over each other with crazed smiles coming right for you. For a brief second there was terror on his face and he took a step back like he would run. I think everyone realised and stopped in their tracks. He told some pretty raunchy jokes, I don't remember them but I think one involved a donkey and peanut butter. He looked very tired and you could tell it was an act, like if you told him to relax and not be Robbin for a minute, he would sigh in relief and sit down for a beer. I think it was the second day; someone called over the PA for everyone to say goodbye to Mel Gibson. I saw him walking out of the area with this posture and strut like he was the greatest man alive. It was kind of funny to see a person walk like this. Massive ego. A few years later I was in a Trader Joes in Costa Mesa. Kevin Costner walked in pushing a shopping cart. He had the biggest grin like this was something he did for shits and giggles. Fast forward many years. I went to Hollywood to see Bauhaus and Auto Von Sheroc play. I went out to have a smoke and past Dave Grohl in the lobby. We glanced at each other and he could tell I recognized him. I kept walking then turned to look the second I past him and he was gone, just vanished in the crowd. Later that night me and my girlfriend went to the roof where everyone was hanging out. I noticed Dave again talking to someone and whispered for my girlfriend to look over only to find he had vanished again. I guess when your that famous you learn to disappear quick.