Garry's Mod began as a Half-Life 2 mod in 2004 before its standalone release in 2006, and became known for sandbox physics and player made scenes. Its damage sounds come from the Source engine style shared by Valve games, where short body impact noises tell players they have been hurt without any on screen text. Clips of ragdoll falls helped the fall damage crunch spread through YouTube and meme edits, and creators still reuse it because the sound is instantly tied to a clumsy physics landing.