if you can't dance
and you can't sing
you can join the Morris Ring-- trad. (var.)
There's a famous maxim, "You should try everything once except incest and Morris dancing." It's not clear who first said it. This thread at Snopes.com lists some of the possibilities:
A quick web search suggests that Sir Thomas Beecham is the most popular candidate, but it's also attributed to Sir Malcolm Sargent, Sir Arnold Bax, Stephen Fry, Oscar Wilde, George Bernard Shaw, and WC Fields (as well as being referred to in the title of books by Jonathan Meades and Linzi Drew). And if I'd been asked before searching, I'd probably have said Noel Coward.
But whomever the author, this video confirms the wisdom of that adage, as the spawn of incestuous Morris dancers shows up to join in the revelry. Or possibly it's an aardvark.
Warning: Music.