Short knock-like blips labeled peng peng peng circulate widely on user soundboards as generic comic impact sounds. With no single confirmed source, versions like this one are typically trimmed from larger effects or recorded as simple percussive taps, then numbered in series for easy reuse. Their appeal is practical: the sound is clean, neutral and extremely short, so editors can drop it into memes, skits and short-form videos without clashing with voices. That versatility keeps this type of micro-effect in constant rotation.