Aside from all the beautiful things we've all mentioned, this will be a concert also remembered for assholes taking flash photos and booing Big Business. From what we read, Montreal was flawless in that field, perfect manners. I'm fairly sure that's why Coady didn't go on for Lateralus, and we got one song less.
Be polite and respect people for their art, if not, you do not belong there, no matter who you are. You do not even have to like the music to respect it. It doesn't matter what sort of scene you grew up in, or if you ''just came along with your friends''. It's just a mutual understanding of all people there.
This is ART, and if you do not take it for that, you will feel out of place.
You know what they do when you take flash photos in a museum environment when you are told not to, they kick you out. And if I were the volunteer Art Historian working that shift,and the person was half as irritating as the supposed Tool fans, that person would also recieve a side order of forehead while they're being escorted out. Because you payed to see it, it does NOT mean you could treat it any way you want. Simple.