A year that you could wipe your ass with and not be able to tell the difference between your shit and what happened during 2015. In fact, you probably can't tell the difference between 2015 and the rest of the 2010's.
A year that Marty {Martin McFly or to his mom as a teen, Calvin Klien(it was on his underwear)}(actor:Michael J. Fox) and the Doc {aka Doctor Emmit Brown}(actor; Christopher Lloyd)go to in the Doc's time machine (dillorian) this year has flying cars and a "sky way", pepsi bottles are hard to open,and any game you play with your hand is supposedly a "baby's toy"
Marty: you mean we are in the year two thousand fifteen (2015)?!?!
Doc: well...i...uh...
Jennifer (marty's Gf): wait i dont understand marty.
Marty: Well... Jennifer, youre in a time machine.
Jennifer: WOW!!! O_O *turns to Doc* you said we have kids right?!?! how many? was it a big wedding with lot's of flowers?
Doc: well...i...uh
Jennifer: OMG! we're gonna see where we live! marty! we're gonna see our future!
Marty: heh...yeah...
Doc: *puts laser beams in jennifer's eyes and she falls asleap.*
all of this is in the air inside the dillorian/time machine