What is the single loudest moment in a sports stadium, ever?

[KUJustin]

I've only been in domes for basketball games, which only fill up about half, and are extreeeemely quiet. Even for the national championship.

I sort of think a smaller building with fewer people might be louder, but again I have no experience in a full dome. I do know that Allen Fieldhouse has definitely gone past the pain threshold at certain times (overtime vs Georgia Tech a couple of years ago, for instance).