Stop-motion animator Kevin Parry uses his Instagram account to make insane film editing optical illusions that will have you asking "How'd he do that?" I've watched them over and over again and it's hard for me to pinpoint how the tricky filmmaking works—probably why Someecards called him "an M.C. Escher with Instagram."
Some of them are relatively simple, belying the sheer amount of work that was probably needed to do them:
Others are freakin' nuts:
And, of course, some rely on some amazing stop motion animation:
He's basically a wizard.