It was practically the anthem for this year's World Series, with tens of thousands of Washington Nationals fans clapping in unison and belting out "Baby Shark, doo-doo doo-doo doo-doo."
In Lebanon, it became a rallying cry after a video of protesters singing to soothe a frightened toddler went viral. And in many other places, the earworm has drawn derision, with late-night comedian Jimmy Kimmel suggesting its creator should be jailed for life.
To the contrary, the catchy tune about a family of sharks has become so lucrative that the Korean family behind it is now sitting on a rapidly growing multimillion-dollar fortune.
Kim Min-seok co-founded closely held SmartStudy Co. in 2010, and five years later its children's educational brand, Pinkfong, released "Baby Shark." His father runs Samsung Publishing, which also owns part of the startup.
Listen: Baby Shark trap remix