There is an 'interesting' mandolin player locally to where we live and play who turns up at some singarounds sometimes. I have walked out on him and a friend has stopped mid song and asked him to desist. Keeps bouncing back though undaunted. Now he suffers from the delusion that bad off key and off tempo mandolin playing is a bonus to any track.

But it still doesn't approach yesterdays thing.

(Omigod - perhaps it's me attracting them! A bit like Jasper Carrott's thing of always having the nutter on the bus sit next to him)