On a boy's trip many years ago (maybe 15-20 years) they had a Red Dog set-up at the Harrah's in Las Vegas. It really was just the dumbest game.

If I recall, the dealer flips two cards and you had to bet whether the third would be in-between the two. If all three cards came up the same number you won a bonus plus the below pin.

It was gone the next year so must not have been to popular.