Our local library has a summer reading program where kids get one marble for each book they read to put in the marble run contraption that they have at the desk.

This is the first week that we've done it and DD6 gets her marbles and looks at the setup for 5 seconds and determines that it is stupid because there is no way for the marble to go through two of the sections. The library worker then comes over to see what she is talking about and eventually realizes she is right and they rebuild it so it will. The funniest part was that they worker started off by arguing with her and then realized that she was actually right. I'm used to being outsmarted by my kids but it is always fun to see the look on other adults faces when it happens to them smile