Not gear related as such but once I nearly fell off the stage. I did the old balancing act. How I stayed on I don't know. The audience found it hilarious. The singer/guitarist had the same problem when the stage collapsed under him. Without dropping a note, he sussed that he had a seesaw to play on and carried on like that for the rest of the gig! Only real gear related was when an Ampeg fridge with rear wheels set off around the stage! It looked like a dalek! The road crew just managed to save it falling off stage too!