Someone linked to this site saying that they never realized Back To The Future was such a rich source of reaction gifs. I agree!
But also an interesting thing in this shot (from Movie Number 3) (again pointed out to me by a reader) is that Marty is dressed as a cowboy just before he goes back in time. And young cowboys get called kid, like “The Sundance Kid” or “Billy the Kid,” so you might call him “Marty The Kid”. But Doc dressed him and its the 50s so he’s got atomic designs on his clothes, so Marty’s actual nickname would be… THE ATOMIC KID.
JUST LIKE THE MOVIE HE SAW IN THE FIRST BOOK / WALKED PAST IN THE FIRST MOVIE
IT KEEP HAPPENING