Headcanon that in the new good future where Marty McFly never has his accident, he does become a famous musician, while still going on time travel adventures with Doc, and then when the internet comes along, people on forums and message boards start discovering and posting photos of people in the past who look eerily like famous rock star Marty McFly, and as time goes on, “Marty McFly is a time traveller” becomes one of the biggest and most long running memes on the internet.
When Doc finds out he freaks out and panicks and makes blog posts (because of COURSE Doc runs a blog) talking about how UTTERLY RIDICULOUS the idea of a time travelling rock star is, which the internet finds hilarious and only makes the meme spread more.
Marty meanwhile thinks the whole thing is the funniest thing ever and is just wheezing at every new forum or jokey article about it, and directly addresses the meme in interviews, bringing up this “crazy conspiracy” that people have, until eventually he can just say things like “well of course I am a time traveller” or “oh you like my hat? Thank you I got it in the 1910s”, and people just crack up, and Marty cracks up too because no-one realises that he’s not even lying.
When Marty starts doing this Doc’s blog posts get even more annoyed and passive aggressive, saying things like “even if time travel WAS possible, a SENSIBLE time traveller would KEEP OUT OF THE PUBLIC EYE and not just TELL EVERYONE LIVE ON TV”
Eventually a secondary meme starts up where people start joking “Doctor Emmett Brown is a time traveller himself and that’s why he’s so worked up about it” and Doc very nearly just deletes his blog and throws his computer in a skip.
