Groaner du Jour

Back in the days of the Roman Empire, the famous Emperor Nero
instituted a new game. The players would take those little
disks you set your glass on in order to protect the furniture,
and see who could get the most distance rolling them across
the floor.

They were the first roller coasters. Back in those days, the
disks were made of iron, and they would bet on whose disk
would roll the farthest.

They called them ferrous wheels.