Lovers of instructions will appreciate this article in the New Yorker:
How to operate the shower curtain.
And speaking of bathrooms, does anyone know the history of that card you get in hotel rooms worldwide. The one that starts "Dear Guest. Imagine the amount of detergent..." and ends "Towel on the floor means 'change this towel'" .
Even the poshest hotel rooms have this card, which never says "Dear Guest. If you really want to save the planet, take your holiday at home next year".