The line comes from Bluey, the Australian animated series about a family of cartoon dogs that became a global family favourite after its 2018 debut. Short, wholesome moments from the show are widely clipped and shared online, and this one caught on because its earnest delivery makes a basic fact sound like a revelation. Fans reuse it in reaction videos, edits and GIFs, especially when someone points out something obvious, keeping the gentle humour of the original show intact.