Peter Potamus is a classic Hanna-Barbera hippo reimagined as a weary office employee in Harvey Birdman, Attorney at Law, the Adult Swim comedy that ran from 2000 to 2007 and turned old cartoon stars into law-firm coworkers. His running gag of asking whether anyone got that thing he sent you became a fan-favourite line, endlessly quoted by viewers who recognised their own office life in it. The clip now circulates alongside other vintage cartoon catchphrases as a reaction sound for ignored messages, surviving because almost everyone has lived through that unanswered email.