Welcome to TikTok Watch. You know, 2019’s version of Vine. This new series unearths the latest TikTok trends, so you don’t have to. Let’s face it, if you signed up, it’d just make you feel really old. When I was in school, a long time ago, teachers were called ‘sir’ or ‘miss.’ Never, under any circumstances, were we permitted to address them by their first names.