Mine happened about 1985. I was working as a keyboard player. The band was doing "She Blinded Me With Science" and they played it very well. Just as we got to the two bar synth break that begins the synth solo, our bassist (who also ran the light show with his feet) totally blacked out the stage lights. Complete darkness onstage. I couldn't see where the synth was, let alone where the keys were. I took a shot in the dark and my fingers landed on the wrong notes. When the lights came back on I played the rest of the solo fine, but the damage was done. I was so pissed!