In the video, Devil opens a box of what he calls "Teppenneitz, the German concept of thinking of the perfect comeback long after the chance to use it has passed." The actual word for that is "Treppenwitz," (pronounced "trep-in-vitz") literally translates to staircase joke in German, because the witty retort usually hits you in the stairwell on your way out. Of course, by then, it's already too late to use it. The term was derived from the French expression "L'esprit de l'escalier," which also translates to staircase joke.