As soon as I typed tailbone, I knew it wasn't right. Not even close, I'm embarrassed to say. Being the geek that I am, I consulted my old anatomy workbook and what I meant to say was: "this ridiculous ischial tuberosity pain better go away"
We here at Moments on the Silver's Screen always strive to be factual -- and educational! Now you know that those little knobbly sitting bones are technically called ischial tuberosities and that they are the little bones screaming at you for mercy while you perch yourself wobbily on a bike seat for an hour.