Source: http://www.vox.com/2014/12/24/7446181/wo...

Just in the Christmas special subgenre alone, Rankin/Bass made 18 specials, of varying length and ambition, between 1964 and 1985. Nearly all of these films revolve around the performance of some Christmas song or another. Nearly all of them deal with the crippling scars of childhood shame.

And nearly all of them are completely off the rails insane.

I watched all 18 of these Christmas specials. At the end, my mind had mostly detached from my body, but once it returned, I was able to provide this definitive ranking.