This is probably the only time you won't want a 10/10. There's an app for the iPhone which tells you how ugly you are. If you're a 10/10, you're apparently so troll, “when you walk by the bathroom, the toilet flushes” (it's what the app says!).
The app costs 99 cents in the App Store and is titled, “The Ugly Meter”. It uses a picture of you (or anyone) and scans it with lines and measurements to give you its 'objective' opinion on how you look. However keep in mind certain limitations. The iPhone camera isn't the most sophisticated. Don't take a score of 10, or even 2, too seriously.