Years ago some friends and I went to a Jewel concert, and we snuck in my friend's Nikon film SLR and a couple lenses. He was terrified we were going to get caught and have his camera confiscated, because there were "no photography" signs posted everywhere. The tickets said it, the venue said it, they made announcements, and yet somehow we still managed to get to our seats in the 10th row and get through almost the entire set without getting caught. If I remember right, someone finally saw him but all they did was ask him to stop, so he put it away and that was that.
He shot like four rolls of film at that concert.