Most of us have seen the movie A League of their own, with Geena Davis, Tom Hanks, Madonna, etc, but I just found out today that it wasn't Geena Davis playing the older version of herself wearing makeup and prosthetics. Instead, it was the actress Lynn Cartwright, from Tootsie.
She looked so much like Geena Davis and they also dubbed Geena Davis's voice, that my eyes saw what they expected to see. I had no idea, and I've seen this movie at least 30 times.