This is a variation on Big Bird’s song about finding what is different. In Which One Doesn’t Belong- there are many reasons why each one could be the one that is different. This is a great thinking and problem-solving site with no correct answers. I've shared their logo above as a sample.
At first, I was all about the shape- but then I realized the font, color (shape and text), punctuation marks, contractions, well, the list could go on and on. Challenge your students to think outside the box (and create their own)! The many “correct” answers make this an option for all grade levels.