My beardie has this habit of perching in such a manner that it looks like he's going to fall off his basking spot. A couple of times, I've moved him so that he's completely on the basking spot proper, but I always find him back in that old position. :)
He'll also inflate and deflate his beard repeatedly (without turning black) when he wants to be taken out to defecate. He absolutely HATES pooping in his cage... which I completely understand, given how beardie poop stinks.