There are a few things that could happen if you were to accidentally bump into another car. If the damage is minimal, then both parties may decide to exchange insurance information and handle the repairs on their own. However, if the damage appears to be more significant, it would be wise to involve law enforcement so that they can assess the situation and create a report. The report could be used by your insurance company to determine who was at fault and how much needs to be paid out for repairs. In some cases, law enforcement may also issue a citation if they deem that one of the drivers was being careless.