The Laughter Case

S1 E31: Zeek tells jokes to Fishtronaut and Marina. During Zeek's show, they hear an animal sound they can't identify. Its similarity to human laughter makes our heroes think it's actually someone laughing. They go after the smiling animal. On the way they find out that vocalization was not laughter at all, but cries for help from a little Hyena who's trying to save her mom, stuck among rocks.