Loudest Concert Crowd Ever?

Generally when the word concert comes up, you probably immediately think of a rock or metal band. And mostly every crowd is loud, especially when there are a lot of special effects like pyro continually going off to keep people interested and "wowed."

The other day Vanilla Ice did a surprise performance of "Ice Ice Baby" during The Package Tour which is New Kids on the Block, 98 Degrees and Boyz II Men. Holy crap what a loud crowd! The shrieking and screaming actually made me jump when I watched the video for the first time. Watching the clip sort of made me wonder if the crowd reaction was one of the loudest in history. I've been in a lot of loud crowds -- but I don't know if any of those experiences compare to the one below. I guess it has a lot to do with women and young girls shrieking or something. What is the loudest concert, crowd wise, you've ever attended?