I've been reading with interest in various threads how people have managed to get a room upgrade in Vegas by slipping the front desk worker a twenty or whatever. How the hell do you do this? I want to try, but I'm mortified at the thought of the front desk worker blinking back at me and saying something like, "Sir, this is *not* a Hollywood movie. We do not do that kind of thing around here."

For context, I'm the guy who loves the discount