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- " Marty could could see that there was no use arguing with him [Doc]. Nevertheless, the desire was still in him to convey the warning. / "Yeah, Doc...I see," he nodded. "Listen, I'm gonna get a candy bar. You want anything?" / "No, thanks." / Marty turned and went into the cafe nearby. He purchased an Almond Joy bar from the perennially scowling counterman and also bummed a piece of paper and envelope. Then he sat at a booth and composed a brief note to Doc. "
- —From Back to the Future by George Gipe (quote, pages 195 and 196)
- " "Were you wearing that [the bulletproof vest] all along?" Marty asked. / "Sadly, no," Doc Brown replied. "The first time around, I must have been taken by surprise. No, my boy, it was your warning that saved me." / With that, he reached into his pocket and pulled out the letter that Marty had written in 1955. It was yellow and brittle, the scotch tape holding it together withered and ready to fall apart. / Marty smiled and shook his head. "What a hypocrite," he said. After all that lecturing about screwing up the space-time continuum..." / "Yeah, well, I figured what the hell..." "
- —From Back to the Future by George Gipe (quote, pages 239 and 240)
On November 12, 1955, Marty McFly, before returning to 1985, wrote Doc Brown a letter on stationery from Lou's Cafe, using a fountain pen, and sealed in an envelope marked Do not open until 1985. It alerted Doc to the Libyan terrorists that would eventually shoot him back at Twin Pines Mall on October 26, 1985.
Marty placed the letter in Doc's coat pocket. However, when Doc discovered the letter, he tore it up and placed the remains back into his pocket. Sometime in the thirty years before the event, Doc stuck it back together with scotch tape and read it. Following its instructions, he wore a bulletproof vest on the night of the world's first temporal displacement. When Marty arrived back in 1985 and discovered that his friend was still alive, Doc produced the letter — now yellow with age — from his inside pocket.
Dear Dr. Brown,
On the night that I go back in time at 1:30 A.M., you will be shot by terrorists.
Please take whatever precautions are necessary to prevent this terrible disaster.
Behind the scenes
- Bob Gale was surprised to get a letter from a young fan in Japan who pointed out that Marty's letter looked different in 1985 than it had in 1955. "Some people don't have enough to do, I guess," commented Gale. Basically, the letter in the first scene concludes with four lines ("Please take whatever/ precautions are necessary/ to prevent this terrible/ disaster"); when Doc taped it back together, the same sentence was on three lines, as seen in the image above. Like the DeLorean odometer, the McFly family candy jar, and the flaps on the shirt pockets, the letter is one of the continuity errors that fans of the films enjoy spotting.
- After 2001, in light of the 9/11 terrorist attack on the Twin Towers in New York, whenever Back to the Future was shown on television, the scene in which Marty is reading his letter was sometimes edited so that he says, "Dear Dr. Brown, on the night I go back in time you'll be shot. Please, please take whatever..." (The words "by terrorists" were redubbed with "please" and were digitally erased from the letter when it was shown on-screen in close-up.)
- In LEGO Dimensions, Marty puts a shopping list on Doc's fridge instead.