This app (Dude, your car!) is so cruel, I'm not sure I should be telling you about it, but it is April Fools' Day so if you really want to pull a prank on someone, at least the damage is only make believe. Quite simply, you take a photo of someone's car, select one or more type of damage (dent, cracked windshield, fire, etc.), make any adjustments and it overlays the destruction on their car! The rest is up to you... just don't blame me when you tell someone 'Dude, your car!'