Some carnival games make for good Bonus Stunts, too. One that comes to mind is the one with the Coke bottle lying on its side, and the contestant has a fishing pole with a shower curtain ring tied to the end of the line. Using the ring only, the player must stand the Coke bottle upright. Much like the one Robair describes, except it doesn't hinge so much on the distinctive shape of a glass Coke bottle, which might be hard to find. (Is Coke in bottles still readily available most places? We're so used to buying it in cans or liter bottles.)
One of my favorites from the Monty Hall version involved something like ten Coke bottles (in this case, any ol' bottle of similar size will do...Pepsi bottles might be better, since they have a longer neck) and a golf ball. The first player would place the golf ball on the top of the first bottle, and then, holding only the bottle, transfer it to their partner, who is holding the second bottle. Player One then grabs Bottle Three, and receives the ball from Player Two, who grabs Bottle Four, and so on down the line. A drop meant you went back to Bottle One, and "all you had to do" was get the ball all the way down the line.