Suppose you are a principal of a school. One day when you hear lots of loud laughter and screams from a classroom which has no teacher for some reasons. You go there to find out why those children are shouting. When you get there, you see two children have sit on their chairs and are screaming and clowning around! You're shocked and want to find out the reason of such a silliness. Do the self-made sentences below make any sense to you? If yes please let me know if they are natural in English. If not, please tell me what would the principal say in such a situation to indicate the same message:
Have you mistaken here with a circus?
Have you mixed up here with a circus?
Have you muddled up here with a circus?