In my early twenties, my friends an I played around video taping (yes, with video tapes!) eating food and then playing it back backwards. Often we would choreograph things so they they looked like they were forwards when when played backwards.
This guy takes it to the next level and earns his internet stardom with a very nice cover of Metallica’s “Enter sandman” recorded forwards, but performed and sung backwards so that when it was played backwards it would sound like it should if performed forwards. Got it? Right.