Ok so the sound is a crowd yelling. The best way for me to explain it is this video http://www.youtube.com/watch?v=UkQ124B9X6Y go to about 1:58 and you'll hear the crowd yelling part. There's got to be an easier way than recording a ton of people yelling the same thing right? Maybe some harmony software or something, anyway let me know if you have a clue as to how i could emulate a crowd yelling
Best way is to get four or five people (even more if you can) into a room and then record multiple takes. There's not any software that you can cheat your way to the same effect with.
^Thats your best bet. The more layers you add, the bigger it will sound.

Also, that red font is rather distracting.
Pink Floyd did it on "Another Brick On The Wall".

5-6 children recorded several times..