One of the most jolting days of adulthood comes the first time you run out of toilet paper. Toilet paper, up until this point, always just existed. And now it's a finite resource, constantly in danger of extinction, that must be carefully tracked and monitored, like pandas?
Adulting: How to Become a Grown-up in 468 Easy(ish) Steps (ed. Grand Central Publishing, 2013) - ISBN: 9781455516896