Try out this free app called Face Swap by Microsoft Research. Though, its only available for Windows Phone 7. The app will be able to detect multiple faces which you can exchange just by shaking your phone.
Let's face it. Everyone parks like an asshole. Including me. But you're an especially bigger one when your car ends up on this Facebook group: You park like an asshole. The group has over 6 thousand members, and is updated frequently, simply because not everyone parks properly. There's a high chance your car is on this page. Read more