This is from the local pizzeria. (A very good pizzeria, I might add, Il Tonello.) The sign says:
The Lemon Game
Put a coin on top of the lemon without touching it. If it stays on top for 10 seconds, you take all the coins.
As soon as the coin touches the lemon, you have to let it go.
And I did it, first try! It was only about 4.50€ but I was ridiculously pleased about it.
And then I had another 5 goes, and failed every time.