IN THE 1985 FILM BACK TO THE FUTURE STARRING MICHAEL J. FOX, WHAT DOES MARTY MCFLY’S MOTHER-TO-BE MISTAKENLY THINK HIS NAME IS? July 14, 2017 By Show answer CALVIN KLEIN. THE REASON, SHE TELLS HIM, IS, “IT’S WRITTEN ALL OVER YOUR UNDERWEAR.” More Entertainment QuestionsMore Movies Questions