a globulator
A globulator is when you walk into a room, lose your mind, and try to write the meaning of life on the wall with a pencil that doesn't work.
I globulated in the library. I walked in, lost my mind, and drew a mustache on the principal's face.
My sister globulated in the bathroom. She forgot why she was there and started singing in the shower.
I globulated during math class. I grabbed a pencil and drew a dragon on the whiteboard.