Humor is perhaps a sense of intellectual perspective: an awareness that some things are really important, others not; and that the two kinds are most oddly jumbled in everyday affairs. ↗
When you become successful on the level that Fleetwood Mac did, it gives you financial freedom, which should allow you to follow your impulses. But oddly enough, they become much harder to follow. ↗
Oddly enough, I think that everybody can relate to revenge, on some level. Everyone has wanted to exact it, at some point, and everybody has tampered with the idea, even if they didn't actually go through with it. ↗