Bei 2 circulates online as an ultra-short reaction clip with no confirmed source, artist, or original context attached to its uploads. Its Chinese title character and numbered name suggest it was saved as part of a batch of brief sounds, then shared onward for editing use. Because it lasts only about two tenths of a second, creators treat it less like a standalone joke and more like editing punctuation. It survives in meme edits and short videos because that instant hit can be reused endlessly without explaining where it came from.