This meme features a comical and fictional comic book cover presenting 'The Diddler' as a spoof villain in place of Batman's real nemesis, 'The Riddler'. The humor arises from the exaggerated facial expression of the character, the intentional misspelling to create a humorous new villain, and the playful interaction shown. People might find it funny because it's a playful and absurd twist on a classic comic book cover, which undermines the seriousness of superhero confrontations.