Depends where you're sitting. If it's general admission and you get towards the middle (assuming they're not moshing to Coldplay), you should be fairly safe secretively smoking some jays. If you're in a seat near in an aisle, you're better off smoking at home, or making brownies. I went to see Jethro Tull a few years ago, so I said I was going to take a shower, turned on the faucet in the tub and got high in the bathroom. I just smoked a little more than usual, and I was still way baked even after dinner and the half-hour drive there. Oh, and I ate a stem when it started, to keep me crazy.

Coldplay's lame, btw.