Billy & Mandy 20th Anniversary thread

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Today is the 20th anniversary of the Grim Adventures of Billy & Mandy, as we saw them for the first time in the pilot "Meet the Reaper" as part of Cartoon Network's Big Pick. The pilot won the contest and was turned into a full series in 2001.

What is /co/'s thoughts on this show? Does it still hold up after all these years?