There are a few things you can do to catch someone who vandalizes your car. First, make sure you have your car’s registration and insurance in hand. If you don’t, you can file a report with the police. second, make sure you take pictures of the vandalism so you can identify it. third, try to talk to the person who did this. They may be willing to apologize and fix the issue. fourth, if all of these measures don’t work, consider filing a police report yourself.