"Come on, join in, you all know the words..." I confess to having done that more than once!

Sometimes songs I know forwards backwards and upside down are the worst ones. The minute I actively try to remember the words, I blank.

Other than that, all you can do is present a cool, calm exterior and follow all the preceeding advice. Or you could try seguing into another song and see if anyone notices?

Good luck!

TTFN M'Lady P.