Good posting from Marje.

If you're landed with a performer whose just regurgitating patter - have some fun with a bit of light baracking! At a friendly singaround you'll get it all the time from mates.   No problem - and good experience.

Being a 'responsive' audience in this way (without going OTT) you're also letting the guest know that YOU know they're just dishing out a 'Line' to you, an audience, which they don't much care about. And that's disrespectful.

Ian Fyvie