Summerfolk in Owen Sound a few years back. The audience were so supportive, the symbiotic relationship was healthy, and in the middle of my set, I threw caution (and my set list) to the wind and did "Not Fade Away" a la Mojo Nixon. And in the middle of the song, HUNDREDS of people hollered "Hey Bo Diddley" in a call-and-response thing I was ad libbing on the spot. About a year later two people approached me as I was wandering through a mall here in Toronto, and recognized me from that night, and told me what a blast it had been.