The Quod was the explosive ball used in the game of Quodpot. The first Quod was created accidentally during Abraham Peasegood's trip to the United States when his wand came into contact with a Quaffle in his trunk. After the ball exploded in his face, Peasegood recreated the effect, and developed the game of Quodpot around the exploding ball.
During a game of Quodpot, the Quod is thrown around by the players, who attempt to get it into a pot at the end of the pitch. The pot contains a solution that counteracts the Quod's explosive nature. For each Quod that is safely handled into a pot, the scoring team gains a point. If the Quod explodes while in the possession of a player, that player must leave the field of play.