The strangest concert I ever saw was Pavarotti at Reunion. My wife was a huge opera fan, it was pretty much all Greek to me, and we got great floor tickets on the 4th row and we got there early. I took a look around and thought of the dichotomy of hot dogs at the opera when the strangest sight I could imagine appears before us and we still laughed about it for years after.
The lights are pretty much up and I catch this sight out of the corner of my eye coming across the front of the venue and I began to see all heads turning to the right. Here comes this guy dressed in denim overalls with a t shirt under at least two sizes too small and he goes at least 300lbs and in one hand he's holding nachos and going at it like a condemned man on his last night and under the other arm is his large soda that he's holding so hard while using that maw to score nachos that the lid is off and it's dribbling all over his leg and onto the floor. Seconds later comes this lady mopping up after him and glaring in his direction.
The funniest thing about it is that all heads that I could see were fixed on this, people weren't even eye shifting, they were full on and most in amazement. As he cleared the scene headed to his front row on the perimeter I didn't realize how quiet it was and turned to my wife and asked "so, Luciana going to sing some country" and it carried and people were really laughing hard. My wife told me I should have gotten the opener's fee that night after that reaction because people were repeating it to others and it traveled back.
The show was fabulous and a once in a lifetime experience that I am glad I had and hearing this live is one of my most memorable experiences in my life, I cried and my body broke out in a sweat and I knew what it was like to be moved by a voice. That piece still gives me chills but hearing him do it live was extraordinary.