I'm not a fanvid person. Once in a while I find one I'm willing to watch, and maybe even like. But aside from my sister's vids and others that have been recommended specifically I've liked, there's not much.
But something made me click on a vid link one of my f-listers posted today. It had a locked password, but I tracked it to Dreamwidth and now, you too can enjoy it. Basically, it's a pan-fandom clip show set to "We Didn't Start the Fire" by Billy Joel. It has almost EVERYTHING you could have a fandom around in it, at least from TV and movies - including the obscure.
Seriously, if you don't see something on here, let me know because I would be curious.
Also? You don't have to guess how they came up with their reasoning for clips, because they tell you
here (and list each source fandom). Go watch, it's kind of awesome. It might even remind you of how LONG you've been in various fandoms (I easily go back to the late 70s with "Wonder Woman" on TV).