Three Seashells.

Film Typeset of the Future collates and identifies the various fonts which appear in science fiction films and begins its trawl with 2001: A Space Odyssey (via kottke). The writer is also handily transcribing chunks of text glimpsed as the people of the future or as is the case with that film, the past, go about their business including bathroom arrangements. Here is what to do if you need to go to the toilet in 2001. In zero gravity:

"This toilet is of the standard zero-gravity type. Depending on requirements, system A and/or system B can be used, details of which are clearly marked in the toilet compartment. When operating system A, depress lever and a plastic dalkron eliminator will be dispensed through the slot immediately underneath. When you have fastened the adhesive lip, attach connection marked by the large “X” outlet hose. Twist the silver coloured ring one inch below the connection point until you feel it lock."

That's just the first step. The "adhesive lip" sounds uncomfortable to say the least.

Incidentally, elsewhere, someone has explained how the three seashells must work in Demolition Man (probably not safe for work - contains graphic line drawings).