The Unhappy Cannonballs are an invention of Dr. Zalost for his Unhappy Cannonball Project. These black cannonballs make people and animals extremely unhappy and lethargic upon contact. Interestingly, they have no effect on Eustace because he is immune to emotions. After being hit with an Unhappy Cannonball, the victim's skin turns green. The remedy to Unhappy Cannonballs are Muriel's Happy Plums.
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