The keystone shit holds all the other poop in place. Once the keystone poop falls, the entire doo-doo infrastructure will eventually follow. The keystone is the densest shit and thus requires the most attention and concentration.
Sweating on the toilet, I put on the Led Zeppelin song "When the Levee Breaks" and waited for the keystone shit to drop.
by asthmaticdan September 4, 2015