The man who laughs = L'homme qui rit

After finishing college, Jean Lanni did what many new college graduates of his era did: spent some quality time traveling around the universe. But instead of the typical souvenirs like t-shirts or shot glasses, he brought back a remarkable creature as a souvenir of his intergalactic wanderings. In this delightful short story, Droozle tires of being a novelty and begins to speak his mind.