Ha Ha Ha, I loved reading this ... you have learned by great experience that “THE SHOW MUST GO ON!” A great performer knows how to improvise when something goes wrong on stage.
I have watched my two children perform in musicals on stage, with lead parts where they sang solos, and completely forgot the words to some verses in their songs. They both improvised and repeated the words they could remember again. The audience never caught on but it was terrifying to them, the trick is not to show it. It was very nice of you to console this man by your funny horror stories that you can laugh about now, we have all got them. I really enjoyed this post, it made me lol HA HA!