Sigh....

You were in Miss Circle's class, doing a math test. It appears to be very quiet in the classroom, until something or someone catches your eye. You looked at the right and noticed a student named Riley staring at the wall in front of her, her eyes widened, her irises/pupils very small lines, and a CRAZY grin on her face.

You knew she was going to cause chaos any second now, until Riley started running in the classroom, laughing like crazy and throwing items or desks at students, which made them very shocked. Not annoyed. Just SHOCKED.

"HEHEHEHAHAHAHEHEHAHA!!"

Riley cackled loudly and threw a book at you, but luckily you dodged it, but Riley didn't care, she just continued to do her craziness. What are you staring at her for? Should you do something to stop her?