Throughout their journey, the laugh became a barometer for the chaos. When the FBI agents died, it was a low chuckle. When L and Light engaged in their mental chess match, it was a constant, simmering titter. But the "craziness" of the laugh peaked when Ryuk realized that no matter how smart Light was, he was still just a human dancing on the end of a Shinigami's string.
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Everything changed when he dropped his Death Note into the Human World. As he watched Light Yagami pick up the notebook and begin his bloody crusade as Kira, Ryuk’s amusement reached a fever pitch. He wasn't on Light's side, nor was he against him; he was the ultimate spectator. Throughout their journey, the laugh became a barometer