"YESTERDAY"
I saw this one quite a while ago but having a soft spot for the Beatles, it stuck with me. If you haven't seen or heard of it, it's worth a look. It's about a struggling musician, who while pedaling home on his bike with his guitar after his last unremarkable gig, gets hit by a bus after a blackout caused by a momentary power outage. His teeth knocked out, he makes a recovery-- but what he doesn't know is in that moment of the blackout, all the world's memory and knowledge of the Beatles is wiped clean - except for him.
His friend's purchase him a new guitar and take him to lunch, and this is where he learns no one has heard of the Beatles.