Have you ever thought of the best comeback only after it was too late? Right before bed, while taking a shower or standing in an elevator, you get your light-bulb moment: “Ahh, why didn’t I think of it before?” The French even came up with a term for that, l’esprit de l’escalier—the spirit of the staircase—and it means that the perfect retort arises only when it doesn’t matter anymore.