Most of us learned how to be "creative" in our classroom behaviour without being disruptive. I recall two fellow-students who would imitate a drum machine whilst waiting for the teacher to actually teach. It was amusing and entertaining and they stopped when the class got going. I also recall conversations during class on a shared sheet of paper (we taught ourselves a non-Roman script from a novel) with another friend, but the teacher didn't stop us because we were still doing our class-work. :-)

Wade.