OOPS! Sorry IanB!!!!That's what I get for being in a hurry and replying to a header name alone without reading the content. My bad!!
I used to play with an exceptionally funny and upbeat sort of guy. He was always happy, and it just naturally rubbed off. One gig, he had a similar time to the one you describe. At one point he broke a string. No probs, he kept going. Then another broke. He was a good guitarist, he worked around the missing strings, but when he blew still more and had all of one string remaining, he threw the guitar over his back, and started "air guitaring". The crowd and everyone on stage lost it. I can only wish that I had the amount of happy-calm he had, but I can say his handling made for a light ending to a potentially yucky happenstance.