Loud sound of knuckles cracking. I had to get my brother to do this, (I've never been able to do it!) Cracking Knuckles.m4a 聲道：2 類型：m4a bones、horrible、cracking、crack、hands、joints、human、knuckles、body 骨頭、可怕、開裂、裂紋、手、關節、人的、關節、身體 資料來源：freesound ( https://freesound.org )
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