They’re lines in Peru that are carved into the ground to make big pictures you can see from high up.
Glen and Jon both agree that Space Balls is weak, but the “combing the desert” gag is perfect.
Glen lost his sense of whimsy.
The easiest explanation is usually the right one, so they’re probably just lines that people cut into the ground because they had a big flat area and thought it was cool. We’re amazed they didn’t make a dick one.
Glen slips in a quick explanation of the Drake equation and the Fermi paradox.
The Nazca Lines are now a Jon and Glen World Heritage Site.