Worst thing is people who have memorized five songs wont change them and wont learn any more and expect you to turn up at their gigs.

Second worst thing is singing to people who would like to sing along but who do not have the lyrics. Everyone should have lyrics and where possible notation.

It takes time to learn lyrics bring your audience into the tent with assistance.

Then there are people who think they know the lyrics and don't quite....what a mess.

As the priest once said.....one day I went in without a script and buried them instead of marrying them. Lyrics and notation can be helpful to stay on track.

One can improvise better with a few tools.

Conrad