From a 1974 Festival in California. Apparently Blackmore was miffed about having to go on stage early and this was the result. The explosion was the best part but I think Blackmore could have used some lessons on how to trash music equipment. It looked like he was dumping equipment he didn't want to haul to the next gig!!!
https://www.youtube.com/watch?v=URnQzst6Y1U