before your eyes. great scott! >> history has now been altered, and this is the proof! >> reporter: "back to the future" also changed the future. at least in some small ways. nike says it actually hopes to release self-lacing sneakers in 2015. and those hoverboards, this is the hendo hoverboard for real. the device not perfect yet but, then again, neither was marty mcfly's. david wright, abc news, new york. >> can you believe the script for that movie was rejected 40 times. >> and those execs are all fired now. it was a big, big hit. disney, our parent company, they thought the film was a little too dirty. maybe it was that scene about calvin klein. >> wasn't dirty enough for us, marty mcfly. look at you. >> look at that jacket. >> why am i your mama? >> that's kind of kinky. >> whoa!