What is this dance that characters in Nichijou do during the episode breaks? I always seen this kind of clip in every of Nichijou episode (but with different movement). You can see them doing that on this Scene

Is this just some random movement?
As far as I know, it's just an original dancing choreography designed to look endearing, cute and fun. Kids on the streets don't usually perform a dance while playing rock-paper-scissors (or jan-ken-pon).