The "birthday cake" button used on the endgame for The Money Maze.
The original standing button to hit after running The $10,000 Dash was replaced several weeks into the show's run--I assume there was a problem with someone knocking it down in their haste to hit the button, as it was pretty light--with a much wider standing mechanism with chase lights. It looked somewhat like a multitiered birthday or wedding cake; it was referred to as that for the remainder of the show's run.
I assume it's either long destroyed or sitting in Don Lipp's basement.