As for disasters, I have them. I suspect everyone else does. This includes a man who know who gets stuck at the same point every time on the same tune he plays in the same singaround.

Glossing over my own attempted solo singing cock-ups.

With hindsight, it was not a good idea to mess about with a tune or two in DADGAD om Saturday afternoon and not play again until Sunday evening.In standard tuning same tunes went, had to thought about and couldn't be found. Ouch.