It works like this: if J.Lo's ass ever spontaneously detaches itself from her body, she gets a million dollars. Considering the perilous situations she puts that ass in, it sounds like a practical move.
Editorial note: Whoa! You've found a super-old post here on BuzzFeed, from an earlier era of the site. It doesn't really represent where we are anymore, and may in fact be totally broken, but we're leaving it up as a part of our early history.