 From here, the ideas began to snowball as the pair would go on to write the script. Lucky for us, this version of the script wouldn't get greenlit, out of fear that it would bomb at the box office, since the most successful comedies at the time were raunchy films like Animal House and Porky's, while Back to the Future was seen as too tame by comparison. However, had this version of the script been greenlit and made, it would have been radically different from the movie we know and love.