There's a joke about a guy who walks around with rabbit shit in his pocket. One day a coworker notices this and asks what the little round pebbles are that his friend carries. The friend replies, "They're smart pills." with a triumphant smile. The coworker is astonished and begs his friend to let him try one. You see, the coworker admires his friend immensely for his intelligence and business prowess. The friend replies, "You're not ready yet." This goes on everyday for a week. The coworker begs and the friend refuses. Until one day, after being begged for the thousandth time, the friend heaves a deep sigh and says, "Fine. You can have ONE." The friend holds out his hand full of the little round pebbles and the coworker, shaking with excitement, snatches one from his palm. Popping the "smart pill" in his mouth with an exuberant smile, the coworker begins to chew. Slowly, his face distorts from joyous expectancy to confusion, then to revulsion. "Man, those things taste like shit!", he cries. The friend smiles slyly and says, "See, you're getting smarter already."
Even rabbit-hybrids still poop pebbles, haha: http://www.mangago.zone/read-manga/part_time_pets/tr/84351/page/13/