What should I do if I've overstayed my Thai visa and want to do a border run? Can I return the same day?

The user has overstayed their Thai visa by a week and is concerned about the next steps. They were informed that border runs are not an option and are curious if they can fly to Malaysia and return the same day. Several commenters confirm that while one can pay a fine of 500 baht per day overstayed at the airport, it is advisable to stay away for at least a couple of days to avoid complications upon re-entry. Others caution that re-entering Thailand soon after an overstay may lead to scrutiny from immigration authorities. The general consensus is to stay longer (preferably outside Thailand) to improve the chances of a smooth return.