"Actually I'm positive Spinal Tap did a few novelty shows back in the L80's/E90's (8 in all I believe) one at the lamented CBGB/OMFUG in NYC. Even one novelty show brings a band into the plane of existence as anyone knows who has ever been in bands. I've been in a lot, some did only one show, and they ALL existed even if no one but the three of us knew it. So Spinal Tap existed. QED."