"Doc Brown sent one of these postcards by using a remote control mail delivery time machine capable of one jump back home where Marty McFly was. Marty heard the message and took the DeLorean time machine and a spare flux capacitor to 1692 Salem, Massachusetts."@en . . "Doc Brown sent one of these postcards by using a remote control mail delivery time machine capable of one jump back home where Marty McFly was. Marty heard the message and took the DeLorean time machine and a spare flux capacitor to 1692 Salem, Massachusetts."@en . "Scratch and listen postcard"@en . . . .