When I was in Las Vegas when they were finishing up filming "oceans eleven" my grandfather came running up to me, yelling "you will never guess who I was playing black jack with for an hour!" I asked who and he said Matt Damon. My grandfather said he was the nicest and most grounded celebrity he has met, and he has met a few. He said Matt was talking about fishing with him and just life in general. Matt tipped the dealer $1,000. I hear he is a nice guy. Can't say much for Ben affleck however.