Some of the best VFX are the simple ones, the ones that trick your brain because it has never seen something like it in the “real world” before, so your brain interprets what it sees on-screen as something way more complex than what actually is going on. This trick is like that.
All we did was reverse the footage we shot, but it works quite effectively.
The only giveaway to this trick are the reversed sounds, which are opposite of real life- they fade up to a sharp ending rather than having a sharp beginning that fades out to nothingness. You could probably spend several hours flipping the sounds and matching them back to the movements they came from, but that would destroy some of the fun and usefulness of this quick-and-dirty effect.