Back to the Future has left such an indelible mark on the cultural consciousness that you can walk up to nearly any random person on the street and quiz them about the franchise and they will know exactly what you're talking about. And that makes it perfect for unexpected improvisational street performances.
Yeah, you heard me.
Picture this: You're sitting outside eating an overpriced New York City hot dog when, suddenly, you become aware that a very familiar couple is seated nearby. That's when the DeLorean shows up.
The use of twins in order to cement the notion that there's an actual time loop in progress is a nice touch. The only thing that's missing is a TARDIS. Because if there's anything people love more than unexpected time-travel shenanigans, it's unexpected time-travel shenanigans that result in a crossover event.
(via Geek Tyrant)