When we were kids, my grandparents and parents and aunts and uncles used to throw money into the pool. Whether it is was for our amusement or theirs -- "how much money are these kids willing to risk drowning for?"* -- I still don't know. But it is either refreshing or horrifying or both that my daughter is susceptible to the same trickery. In shallow water, of course; we're not barbarians.
* = In truth, the answer is $0 -- we dove for quoits. For free. We're insane.