The first concert I ever saw was AC/DC on the For Those About to Rock tour at the "Gahden." There was talk before the show that they weren't going to be able to use the cannons because the old building wouldn't be able to handle the reverberations.
I still remember watching the bell slowly come down from the rafters to open the show like it was this morning. They were, by far, the loudest band I've ever seen.
I saw them at the Capital Centre outside D.C. in high school on that same tour. I can remember sitting in geometry the next day not being able to follow what the teacher was saying because my ears were buzzing (literally). It took a couple days for the buzzing to go away completely. Only concert that's ever done that to me.
I saw them again in August 2015 at Gillette Stadium. My head was ringing the next day after that one too.