Egg-dropping is a difficult and controversial technique. It makes all robos open to attack by the Umbrella Pod, even if they normally are not affected. An "egg-drop" can be performed with a robo that has considerable aerial qualities, an Umbrella Pod, and an Acrobat Bomb. It involves exploitation of the "physics engine". From huge heights, the pods fall very fast, and can't slow down fast enough to stay airborne, causing them to fall to the height of even the shortest robos.