Error 37 and Error 3003 might have been the popular ones in Diablo III's first burst of popularity, but the Mega64 folks have found quite a few other... "interesting" ones.
I rarely shield my eyes from anything, especially not from a silly YouTube video, but Error 5 really horrified me. I guarantee you haven't seen Error 5: Too Much Poopsocking in your rounds of Diablo III.
Ok, I *hope* you haven't seen that error...
Mega64: DIABLO 3 - NIGHT OF 1000 ERRORS [YouTube]