The classic casino rip-off machine
One of the most popular games in any casino is the slot machines. These things don’t rely on your quick maffs to make a tiny bit of money. It’s all luck, so if you lose, you lose fairly. If you win, it’s because the slot machine gods were looking over you that one time.

But listen to this slot machine designer before you even thinking of pulling the lever. In his or her own words, “Don’t play slots.” These things don’t dispense coins randomly. They’ll rig the machine to let people “win” every 100,000 pulls or so. It’s a dirty, dirty scheme, but then again, the house always wins.