Opposite Day for Dinopotamus

It's Opposite Day at school and all the kids get easy puzzles, like fill the glass and open the door. But when the teacher asks Dinopotamus to bring her the big box, he gets nervous because he's not your typical student. Opposite Day means you get to break rules and disobey instructions. But only if you get it right. Or maybe you need to get it wrong. But how do you know if you broke the right rules