"I got a porcupine called 'Zazoom' He leaves his scent on people's graves." -- "Russian Unicorn"
You know the Kuleshov Effect, illustrated by the famous Soviet montage experiment in which an actor's performance seems to change, depending on whatever image (a bowl of soup, a child in a casket, a beautiful woman) appears before identical footage of his face in close-up. Performances in the movies only begin with what the actor does on the set. They are created and re-created every step of the way, from editing to final sound design and mixing (effects, looping, punching, music, etc.). There's also what I would propose we call the "Russian Unicorn Effect," after the amazing music video parody by Bad Lip Reading.
OK, it's already kind of got a name -- the McGurk effect -- and it was "discovered" in 1976 by cognitive psychologist Harry McGurk and his research assistant John MacDonald -- and it explains how sounds can change perceptions of images and vice-versa.
I saw and heard the parody above ("Russian Unicorn") a few months ago, which led me to check out the original Michael Bublé video ("Haven't Met You Yet"), below. I could not believe the difference. Try it yourself -- first the parody, then the original here (embedding disabled, unfortunately).