Let's face it, there is always someone at any family get together who hits the free bar a little too, well, freely and then expects everyone to join in with their pretty shocking dance routines based on acts that were around for five minutes in the seventies and eighties. Of course, if you have any sense you will simply ignore Uncle Jack and hope that, sooner or later, he will go away. Or collapse in a corner to sleep it off. Either way, hope springs eternal.
In the meantime, though, altogether now! Y-M-C-A!