There's a scene in Back to The Future where Marty and Doc are having an awkward conversation about Marty's mother. It then ends in a homophobic remark. Luckily, it was taken out!

Marty was nervous about potentially having to hit on his own mom.

He was reluctant of course.

He then makes a blatantly homophobic comment, remarking, “This is the kind of thing that could screw me up permanently. What if I go back to the future and I end up being gay?”

The scene was left out, but was reportedly included in the DVD extras of the movie. Check it out below: