Pretty In Pink's Original Ending

'The original ending to this film depicted Duckie getting the girl, however the test audiences said they would have preferred to see Blane win Andie's heart.

Additionally, Molly Ringwald was sick during the filming of the ending, and John Hughes wasn't satisfied with the editing. He was also concerned that audiences would take the original ending as a message that poor people and rich people don't belong together.

When the ending was re-shot, all of the principal actors had to be called back. Andrew McCarthy had already lost a substantial amount of weight and shaved his head for a new role in a New York play called "The Boys of Winter". Although he wore an auburn wig, he's noticeably more gaunt in the re-shot scenes.'

IMDB