Can my friend extend his 30-day tourist stay in Thailand or does he have to do a border run?

The poster asks whether their friend, who entered Thailand on a 30-day tourist visa, can extend their stay by applying for an extension at Changwattana or if they must make a border run to Laos. Commenters clarify that the correct term is a visa exemption stamp and discuss the options available, including paying for an extension or making a border run to another country.