Japan has come out with these Calorie Shaper "panties" (the site is in Japanese, so good luck reading it!) Apparently there's some sort of product inside the underwear that makes burning calories easier. Personally? I think it's a huge rip off.
ABC did a little investigating on the product, an the video confirmed my suspicions...the whole idea is just weird and the commercial is pretty hilarious (it's included on the ABC video).
If you feel the need to try them out, you can get a pair for under $40.