H3H3 is the name of the long-running comedy channel H3H3Productions, created by Ethan and Hila Klein and known for reaction videos, interviews and internet commentary. Repeating the name as a chant turns the brand itself into a joke, which is why short clips of it circulate as reaction sounds and intro stings in fan edits. It survives because it is instantly recognisable to viewers who know the channel, even without any other context, and it fits neatly over a single moment.