The sound comes from Geico's 2013 Hump Day commercial, part of the Happier Than campaign, where a camel wanders a dull office on Wednesday asking coworkers if they know what day it is. His repeated call to Mike became the most quoted part of the advert and spread quickly as a GIF, remix and soundboard clip. It returns every Wednesday on social media, in group chats and in workplace jokes, long after the original advert aired, because the phrase instantly signals midweek relief.