The 'Batman smells' rhyme is a playground parody of the Christmas song Jingle Bells that has circulated among children for generations, with no single known author. Kids have chanted countless versions in schoolyards, each adding new verses about superheroes and cartoon characters. The internet gave the old joke a second life as short sung clips shared in holiday memes, reaction videos and remix edits every December. Its staying power comes from pure nostalgia: almost everyone remembers singing it as a child.