AC/DC on the Back in Black tour.... a little background for yah... at the time I lived in a medium sized town, a couple of hours from Toronto. This stop on the Back in Black tour was really just a warm up for their North AMerican tour... work out the bugs on a small audience and make sure everything is working, before we hit the stadiums...
So they had their entire Stadium sound system up and running in a venue that only held 5000 people, including everyone standing (read hockey arena). I was in the front row, general admission tickets and it was incredibly painful it was so loud. The gong in Hell's Bells solved my constipation issues immediately!
Actually, it was so loud that between songs when Brian Johnson spoke to the audience, we could not hear what he was saying... it simply hurt too much.
I ended up stuffing tissues in my ears and only after that, was I able to understand Brians audience chatter... barely!
A close 2nd for me was Blue Oyster Cult opening for Black Sabbath, at Joe Lewis arena in Detroit. The BOC boys were loud, but when Sabbath hit the stage, I was pretty sure that I would never be able to father children from that point foward... and I have seen the Who a few times, but only at out door shows... still pretty loud!
Fishheadjoe