The Three Seashells
In the 1993 action movie, Demolition Man, Sylvester Stallone plays John Spartan, a grizzled cop living in a nightmarish Los Angeles plagued by gang violence. Spartan gets frustrated with bizarre, futuristic technology, even in a precinct bathroom. Instead of toilet paper, the bathroom has a shelf with three seashells. He has no idea how they work, and the other officers just laugh at him.