Talk to the hand

Anyone who has ever watched Jerry Springer (or equivalent) will have heard the phrase "Talk to the hand (because the face isn't listening)". It's a phrase used by people who know they don't have an answer but desperately want to have the last word and so they're cutting off the conversation on their own terms regardless of how stupid it makes them look (like the word 'Meh', which is used in similar ways).
Sometimes someone will come up with a variant - I've heard "Talk to the elbow 'cos even the hand doesn't care", which I thought was fairly witty if it was an off-the-cuff riposte.
But does it have to be the hand we must talk to? Can we talk to other body parts too?

Talk to the bowel because you're both full of crap.
Talk to the scrotum, 'cos you're talking bollocks.
Talk to the arse, 'cos you're talking crap
Talk to the kindeys, 'cos you're takin' the piss
Talk to the gall bladder and you'll get a stony reaction.
Talk to the spleen because you're both full of bile*

^{* Yes, I know the spleen doesn't produce bile, but I wanted to put a spleen reference in for robinbloke and this was the best I could do.}