Marty McFly: oh man definitely gonna have sex with my girlfriend tomorrow night
Back to the Futures 1, 2, and 3: ffffft
Marty: oh man oh man, gonna have sex tomorrow in the car
Biff: I wrecked the car
Marty: oh no now i have to spend a week in 1955
Marty: phew i'm back now, time to have sex with my girlfriend in the car
Doc Brown: marty you gotta come with me to 2015
Marty: goddammit
Doc Brown: you can bring your girlfriend
Marty: oh thank god
Doc Brown: we're leaving your girlfriend in a dumpster
Marty: GODDAMMIT
Doc Brown: also we fucked everything up, and now i'm in 1885