The Japanese term "MAD" videos represent a super-set of what's called "anime music videos" in North America. Parodies, remixes, reanimation, juxtapositions, and theme compilation are also included under the fan video heading. A remarkably pretty new somewhat AMV-like MAD movie collects some of anime's great moments dedicated to spotlighting hair.
It's not necessarily especially extravagant hair, or the hair itself that's notably well animated, but well crafted scenes that put the focus on a (female) character's head of hair.
What hair related moment in anime do you remember most vividly?