At my high school, it was to create a folder with an… incriminating name. Then, screenshot the desktop, delete the folder, and then set the background to the sc

At my high school, it was to create a folder with an… incriminating name. Then, screenshot the desktop, delete the folder, and then set the background to the screenshot. When the …mark… sits down, inevitably with several… "witnesses" behind them, who then point out in "astonishment" the folder on their desktop, they try (in vain) to highlight it to delete it. (Not appropriate for the workplace, of course.) Also, scotch tape is not transparent to optical mice? and blocks the sensor. Had that one pulled on me once, took a while to figure it out.