Armed with a blindfold, a fluro costume, and a personal music player (OK, it's a promo for a new LG phone), they must dance on the spot for as long as possible to 4 songs on a loop. The HM who lasts the longest wins a prize. I'm guessing they win one of the phones they are using.
It's one of the funniest sights I've seen. All you hear is Rory coughing every now and then. How long will they keep this up?
