If you accidentally hit someone else's car, it is unethical and possibly illegal to leave the scene even if no one sees it. Regardless of the severity of the accident, the right thing to do is to take responsibility and take appropriate action. Here are some key steps you should consider： 1. **Leave contact information**: If you cannot find the owner of the car immediately, you can leave a note on the other party's car stating your name, contact information and a brief description of the accident. This way the owner can contact you to deal with the accident further. 2. **Photographic evidence**: Take photos of the scene of the accident, including the damage to the two vehicles, the surrounding environment, and any details that may be related. These photos can be used as evidence for subsequent handling of accidents. 3. **Alarm**: In some cases, especially if the accident caused greater damage, you may need to call the police. The police will record the accident and issue an accident report, which is very important for subsequent insurance claims or other legal procedures. 4. **Notify the insurance company**: Even if the accident does not appear to be serious, you should notify your insurance company as soon as possible. They can guide you on how to deal with the accident and make sure you comply with the terms of the insurance contract. 5. **Moral responsibility**: Even if no one sees it, leaving the scene may make you feel guilty. Taking responsibility is not only respect for others, but also an explanation of one's own conscience. Leaving the scene without taking any action may be regarded as a ”hit-and-run", which is a serious violation in many places and may lead to fines, points deductions and even criminal liability. Therefore, the best way is to face it honestly and actively deal with accidents. Hope these suggestions are helpful to you! If you have other questions or need further suggestions, please feel free to let me know.