Dunkin lottery

When you order a drink from Dunkin Donuts, and wait to see whether they actually serve you the correct drink (a.k.a. "winning the lottery"). Like the actual lottery, the chances of winning are very slim, and it's probably not even worth playing in the first place.

"I played the Dunkin lottery today. Lost, as usual."
"That's how the lottery makes money, from idiots like you!"