Here’s a fun one. For Valentine’s Day, my mom sent the kids a puzzle. She had opened it and sorted the pieces into individual bags. In addition, there was a bag for me, with no puzzle pieces, but a $20 bill and a note explaining that if the kids could work together (without fighting) and finish the puzzle, then I was to use the money to take them out for ice cream. It didn’t say what to do if there was fighting, so I told the kids that I would get to keep the $20.
Well, we finally had a free night, and so I pulled it out and gave handed out the pieces.