Pretty in Pink (1986)

Revealing mistake: When Duckie is showing off on his bike, you can see its not Duckie but his stunt double.

Duckie: What now?
Andie: Bed.
Duckie: Yours or mine? Ours?

Trivia: When Andie and Duckie are in the car, she stops in front of a large house and says it's her favorite. Later it's ironically shown to be Steph's house, where she attends the party.

Krista