Thank God It's Friday (1978)
Girl and Boy A are dancing.
Boy B comes up and asks Girl: Do you mind if I cut in?
Girl asks Boy A: Do you mind if he cuts in?
Boy A: Not at all!
Boy B turns to Boy A and they boogie down, leaving Girl to stand to the side.
It also has the most bomb ass soundtrack, some sleaze and bad dialogue, cornball accents, a crossdresser shaving his chest in the washroom, and it's not that good apart from the OST. Missed the first half hour, was on and off after "Brick House" and kinda zoned out.
3/10