I like the Beatles, and there's the obvious clique joke of "John beats his wives, ya know?"
I like a grand total of one Megadeath song, "Hanger 18". That bad is very troublesome. I feel bad for enjoying it, but I don't pay for it, so I guess that's better? But it's nostalgic for me, and I like the words "Military intelligence, two words combined that can't make sense."
I'd have to go through each bands' wikipedia page, but I think some of the worst things are;
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Disagreed on who wrote what, leading to members leaving or the band breaking up
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Disagreed on who owns the name, leading to court battles and the band splitting in two
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Important members leaving, and while the band is still fun to listen to both new and old songs, its not the same
And of course the dreaded sin of "Why does no one know who I am talking about, they need more fans." but that's not really a thing of their own.