we have an apron of sorts that has stuffed body parts with velcro keeping them in place (so you can put it on and see where all your parts are.)
a little girl puts it on and i point to the stomach and ask her what it is.
then i ask her about her lungs.
after we're done with the conversation, she starts telling one of her friends all her parts while pointing to them. "...and this is where i poops!" she says pointing to the intestines.