Can't Get Image Out of My Head

This is a really sweet blog called Shelba the bionic valentine...she has a very creative eye for photography and writes whimsical little posts about her days and her beautiful kids. Posts like this make me smile : "You know you are lazy when - You put your underwear on backwards and it is too much trouble to take them off and put them on correctly. Guilty as charged. " But the image that i can't remove from my head and might think about for the rest of the day but not on purpose is the idea that she has a mechanical heart valve and when she opens her mouth you can hear her heart ticking. That makes me so curious and heebeejeebed at the same time...