The phrase comes from Pixar's 2003 film Finding Nemo, where Dory, the forgetful blue tang voiced by Ellen DeGeneres, sings it to encourage Marlin while searching for his son. The scene turned a simple coping mantra into a widely quoted movie line. It later returned in Finding Dory in 2016 and spread across social media as a shorthand for staying positive during difficult tasks. Its lasting appeal comes from how instantly recognisable Dory's cheerful delivery is, making it a staple for motivational edits.