I saw that a while ago, and it is definitely the best of the maker's "epic rap battles."

Not only is Stephen Hawking cooler than Einstein, but he totally destroyed that "troll doll" in the rap. The "mustache on a troll doll" is the funniest line, and the packing all the ugly particles into one nerd line is overall the best. Go Hawking!

Hell, general relativity may not even survive the continuing development of quantum theory, mostly the inevitable quantum theory of gravity.