Don't Be A Toilet Paper Scrooge

Take heed, studiers: this sign is posted in Harnwell's rooftop lounge.

We assume they're espousing a Marxian "from each according to his ability, to each according to his need" theory of toilet paper consumption, i.e. take only so many squares as you need rather than stealing rolls like a greedy little bitch. It is so good of housekeeping to remind us to be considerate of our fellow man.