Shrumal Warriors are mushroom enemies in Hollow Knight, the 2017 metroidvania from Team Cherry, encountered mainly in the Fungal Wastes where they charge at the Knight with a spear. Their distinctive waow cry became a small in-joke among players because it sounds like a startled human exclamation rather than a monster noise. Clips isolating the cry spread through gaming edits and soundboards, where the 0.7 second burst is now reused far outside the game as a quick surprised reaction.