Epic Rap Battle -- new (December 2014) -- 2 big name directors
https://www.youtube.com/watch?v=_wYtG7aQTHA
Steven Spielberg vs Alfred Hitchcock.
And then they're both knocked down a peg by a third.
And soon followed by a fourth.
They really gotta stop naming these so dishonestly ;)
Season 4 seems pretty weak to me, other than Zeus vs Thor, LEGO edition: http://youtu.be/i_xFOmYxKYw