In Predictably Irrational, Dan Ariely writes about the silly reasons that we use to make big decisions. Turns out we gladly overwork without pay, we overvalue what is free, and there is no hope for us when the zombies come. Plus, in this episode, Dave talks about a study that proves most of us would be fine electrocuting strangers, and Kellen tells a story about the worst way he's ever been introduced on stage.