Tesla’s latest over-the-air software update for its cars is perfect fodder for online viral videos. It added a feature the company calls “smart summon.” Owners use an app on their phone to summon their cars from about 200 feet away, and have it drive to them all by itself with nobody inside — just hold down a button. Ars Technica’s Timothy Lee, who watched 100 videos Tesla owners have uploaded using the smart summon feature, said the results seem to vary.