Sprunki is a fan-made horror mod inspired by Incredibox, where cheerful music-making characters gain darker horror forms, and Mr Sun is one of its recognisable cast members. Clips of his jumpscare spread through gameplay videos, shorts and soundboards as fans reused the loudest horror moments for edits and reactions. The sound stays popular because it is instantly recognisable to Sprunki players, easy to place at a reveal, and strong enough to carry a scare on its own without extra effects or explanation.