It is the mating dance for humans.
Well, its not like you can really talk with that noise. Physical attraction comes first, and dressed up all smart like a flamingo showing off its feathers, then strutting around on the dance floor like a bird in the jungle, now and again you see blokes fight it out like some wild goats to get a female.
David attenbough should do a documentary on it, seriously, i find it funny about the whole clubbing scene. I used to like it, and enjoyed it, but now older, looking back it seems how did we get here? When did humans, with all our intelligence get so primative?