Swear this is original, but someone must have come up with the idea before now. Perhaps a repressed memory?

An old man was sitting at an outside table of a bakery in Montreal, enjoying some coffee. As a limousine raced by, a tiny object flung from the window landed nearly at the man's feet. Several seconds later, a violent crash was heard in the distance. The old man picked up the object and examined it. It appeared to be a very old small coin with some French writing stamped in it. Not knowing what to think of it, he placed it on the table in front of him and drank some more coffee. The man stared in stunned silence as the coin sprouted tiny legs, then got up and raced in circles on the table. Finally after several seconds, the coin stopped and lay where it was, the tiny legs disappearing back into it. The astonished man was apprehensive but took the coin with him as he left the bakery, wondering if he had come upon a valuable find.

He was found dead on his balcony the following morning, with a look of horror frozen on his visage.

The moral:

Keep away from a Runaround Sou.

In this case, 'gag' is an apt characterization.

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