An elementary school in Iowa has been enjoying this all year:  Someone’s been hiding rubber duckies around the school every day since the start of the school year, and no one knows who.

They stopped counting after a while, but say it’s easily over 200 rubber ducks now.  The kids love it, and the teachers are finding ways to incorporate it into their lessons.  For example, if they read enough books, they get to take a picture with the ducks.