Can You Guess What Instrument He's Playing?

Here is a clip of Seth pretending to play an instrument.  Can you guess which one?  His older sister plays this instrument, but on Sunday evening a young man played this instrument for the youth Standards Night.  Seth found a broken ruler and turned it into this instrument.  Now I know what you're thinking, first the post on the holes in the door and now my youngest playing with a very sharp broken ruler.  I assure you that we promote non-violence in our home.  (It's got to be all those Harry Potter films, or maybe was it Lord of the Rings? Oh man, they were good movies.)