I've found that most of my students (17-22+) are not aware of movies previous to the last 10 years or so, so any references I make previous to that is met with "huh?".
I used to watch AMC (back when it was "American Movie Classics,' and actually showed classic movies...I don't know what the AMC stands for now...ever since they got rid of the black and white moves, and started playing pretty much anything...maybe it's now just "American Movie Channel'? I remember once in grad school, an instructor made a reference to the original movie "The Fly" with the human-headed fly at the end saying "help me...help me" in a little fly voice, and most everyone else acted like he was crazy. I got the reference right away.