The first 'rebellion' (I'm sorry I really couldn't think of a better word)or fall, is described in the 'Athrabeth Finrod Ah Andreth' in Morgoth's Ring HoME 10. In it, men were wooed by Melkor, and Eru said that their Hroa would be weakned so that their Fea would come to him quicker and admit that he was god, not Melkor.
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“If I’m more of an influence on your son as a rapper then you are as a father then you've got to look at yourself as a parent” ~>Ice Cube.
"Life is so beautiful"->Don Vito Corleone
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