***IMPORTANT*** Get a timer. Tell someone to click each green box that appears. First click the green flag and start timing as soon as they click the first box. Write down the time once the boxes stop appearing. Then do the same thing, but instead of clicking the green flag, press the space bar. Finally, do the same thing but instead of pressing the space bar, press the up arrow. Ask if they noticed anything strange. Tell them to explain.Then show them the times. Ask if they were surprised by the results. Try it yourself! Feel free to download if you don't realize the difference.
