While I've been to a number of bands that are sort-of hardcore, and pretty damn energetic, like Hell Is For Heroes and Hundred Reasons (who people actually moshed to HARDER than to Thrice, a very much hardcore support band), the most INSANE people are at Feeder concerts.

Feeder don't have a single violent word to say in any of their songs, or even sound violent, but the fans are just insane, it's wonderful.