Behold the magnificent taxonomy battle royale! The meme starts with kindergarten logic ("they swim, therefore fish!"), evolves through actual biology ("mammals, not fish!"), then spirals into increasingly galaxy-brain arguments about cladistics and scientific definitions.
By the end, we've abandoned all scientific reasoning for the ultimate authority: a 4-year-old's classification system. Because nothing settles scientific debates like the unwavering confidence of a preschooler who probably also believes unicorns are just horses having a good hair day!