Funnily enough, the first time I saw "Scrubs," I said, "Hey, that guy was in 'Clueless'!"
Just the other night I was flipping through the channels and found some 70s flick. The scene in question was a group of schoolgirls (high school or college), one of whom apparently had some kind of psychic abilities. I thought one of the other girls kind of looked like Daryl Hannah. Got online to do some checking - it was "The Fury," a 1978 Kirk Douglas movie, and Hannah's first credited role.
Also, I was surprised when I realized the Mac guy from the TV commercials was the nerdy fan who helped save the ship in "Galaxy Quest."