I once did a support to the great Archie Fisher. I did an introduction for a Steve Earle song with a bit of a spiel. Now I have a habit of playing a verse on the guitar as an accompaniment. I started to play but realised I was doing the accompaniment of 'Song for the Life' by Rodney Crowell !! After what seemed ages (but probably was only 30 seconds) I finaly got into my head the right tune and started again with the correct tune to.....'Sometimes She Forgets' !!!