I don't dance in front of adults. Never. It's a hard and fast rule that I have, mostly because I look like an idiot when I dance, and really ... I try pretty hard not to look like an idiot in front of other people.
But pull up Pandora, clear the path of stray toys, and give me a kiddo or two and man, I can party like it's 1920. Or something.
Spring this one on your kid. Even if you're not a dancer. Even if they are going to look at you like you have six heads. Even if they are teenagers. Turn on something infectious (my kids loved hearing the songs I thought were cool in junior high) and just go for it.