Went to see John Martyn at York Uni once- I got sat in the front row in front of him, he was passing out real good joints, in the end-it didn't sound to us that much was wrong except that he kept mumbling and swaying. The rest of us in the front were as stoned as him, by the end so it was ok. I suppose if your going to get pissed or stoned on stage, get the audience that way aas well and then nobody'l notice or care!!