You can tell how popular a sport is getting by the number of movies made about it. Don't think MMA is hot right now? Check your video store and you'll see movies just like Circle of Pain adorning the shelves. Some are good, some not so much, but NONE has what COP has: Bai Ling's Nipples of Death!!! She hugs you on a cold day and you've got TWO Circles of Pain in your chest! Also starring Darlene Escobar, Shannon Lepard, Nicoll Dawson and Caitlyn Howe.