Ten years ago, the Mrs. and I took all the change we had collected a large Snapple bottle, and converted it into cash money via Coinstar. We decided that this qualified as "found" money, and thus decided to spend it frivolously. I used my half to purchase this Hallmark Keepsake ornament of the Starship Enterprise 1701-E.
The Mrs. mocked my choice, and said that this was even a waste of found money. She must not have realized at the time how this ornament would continue to bring pleasure year after year. I'd say this was money well spent.
So what did she wisely spend her half of the money on? Neither of us even remembers.