Mysteries from my childhood resolved in an ESPN interview with the creator of NBA Jam (via Reddit);
It’s true, but only when the Bulls played the Pistons. If there was a close game and anyone on the Bulls took a last second shot, we wrote special code in the game so that they would average out to be bricks. There was the big competition back in the day between the Pistons and the Bulls, and since I was always a big Pistons fan, that was my opportunity to level the playing field.