Schrödinger's cat. I also explain the hit or miss lyrics.
Wikimedia links used:
https://commons.wikimedia.org/wiki/Fi...
https://en.wikipedia.org/wiki/File:Qu...
(I did make some minor changes to the original, namely, cut and used certain parts and cropped the video.)
Music by David Vitas.
Along with that beautiful recorder song by Matt Mulholland.