Gon Freecss is the young protagonist of Hunter x Hunter, the manga by Yoshihiro Togashi that was adapted into popular anime series in 1999 and 2011. His earnest, impulsive personality made his short reaction lines easy to isolate as soundboard clips. This oh crap moment spread through anime edits, Discord servers and short videos where creators needed a pure, innocent panic reaction. It stays popular because it is instantly recognizable to fans but also clear to anyone who has never seen the show.