 You're hearing it now just by me asking that question. You're hearing the clang, clang, clang of those coins hitting the metal tray at the bottom of a slot machine. I want you to think about that noise for a second. Everybody loves that noise in a casino, but why? Anyplace else it would be very, very annoying. If someone was making that noise in your house, you would hit them over the head with a broom handle and tell them to knock it off.