the three seashells

have you ever wondered what those god damn sea shells do in Demolition Man ? wtf.

John Spartan: [whispering to Lenina] Look, I don’t know if you guys know it, but uh… you’re out of toilet paper.
Alfredo Garcia: [confused] Did… did you say toilet *paper*?
Lenina Huxley: Um… they used handfuls of wadded paper back in the 20th…
[Lenina, Alfredo, and Erwin all laugh]
John Spartan: I’m happy that you’re happy, but the place where you’re supposed to have the toilet paper, you’ve got this little shelf with three seashells on it.
Erwin: He doesn’t know how to use the three seashells! 

[last lines]
John Spartan: But there’s just one thing I wanna know…
Lenina Huxley: Hm?
John Spartan: How’s that damn three seashell thing work? 

do you guys have any ideas?