Well, it's pretty complicated, but I'll do my best to...you know, summarize.

First of all you got deeze bones down dare; day keep yer bum from hittin' da floor. Den you got doze bones up dare, day help ya reach fer stuff dat's not so close. Finally you got dem bones over dare, we don't really know what day do, but sometimes, when da wind blows thru em' jus' right, day make dis perty sound; kinda like clams havin' sex with the lights on, but not quite.