Miss Circle was in her secret room in the school because it was her break. She was relaxing when she found some blueberry gum and she ate it. 

First her skin is going to turn purple like a blueberry and then she is going inflate like a balloon with juice. She is going to turn into a giant blueberry. And her voice will get high pitched.

Miss Circle is from FPE she is A Math Teacher who kills students that gets F Grade or Those who Fail In her class with her Compass That is planted in her hand.