Even Apple CEO Tim Cook didn’t know this iPhone feature, do you?

Apple CEO Tim Cook was caught off guard when asked about a basic feature of the Apple iPhone’s iMessage app. Despite being the head of one of the world’s largest tech companies, Cook appeared confused when the journalist Ben Cohen asked him about naming group chats in iMessage.

Every day, Cook’s life revolves around using Apple products. Cook starts his day early, waking up at 4 am to check his iPhone for emails and overnight sales reports.