When I was a wee lad I once attending a birthday party with a unique cake. Placed inside the cake were coins wrapped in tin foil. As you ate your cake you could come across these dimes, pennies, nickels and quarters which you could then keep.
I was thinking about this idea for a kids party and I now realize how completely insane the entire concept is. Actually, it's downright dangerous. How many kids had to needless choke to death because quarters were intentionally placed in their cake? And it's not like they were putting twenty dollar bills in the cake either. Even back then, a nickel didn't get you very far. Between the choking hazard and complete cheapness of it all I wonder how the heck this evil baker got away with it all.