This reminds me of a “Deep Thought by Jack Handey”:
“Instead of raising your hand to ask a question in class, how about individual push buttons on each desk. That way, when you want to ask a question, you just push the button and it lights up a corresponding number on a tote board at the front of the class. Then all the professor has to do is check the lighted number against a master sheet of names and numbers to see who is asking the question.”
