Standing there virtually motionless and giving dirty looks to the guy next to you because he's cheering, laughing, having a good time, and --
HORROR OF HORRORS!! -- clapping in time with the music.
Srsly. This happened when I went to see the Go-Go's during their 2001 reunion tour. It's a freaking concert, people! The musicians like it when you show some sort of appreciation for their work! "No, I guess I'll just stand here and listen quietly. I can have fun just standing in place, without going 'woo' at the end of every song like
this jerk --> next to me or clapping in time with the songs."
Or the time I went to see Bette Midler. You do not sit quietly for a Bette Midler show. Except for the slow songs. During intermission, the woman behind tapped me on the shoulder and said she was having just as much fun watching the show as she was watching my reaction. She was there with a friend who was going through a bout of chemo, and they both liked being surrounded by the good vibes. And then the woman sitting next to me piped up I was yelling too loud. So during the second act I kept yelling, except I cupped my hands around my mouth.