Frozen Computer Prank

This is an older technological prank that anyone can do. You will need to get access on someones computer (a coworker, family member, ect.) and they will need to have PowerPoint. When you get on their computer press the "Prnt Scrn" button on their keyboard then open PowerPoint and rightclick and click on "paste" then adjust the picture to fit the powerpoint screen. Next, adjust the settings so that it is in "kiosik" mode. Then, just start the slideshow and whenever they click anywhere on the screen the computer will act like it is "frozen".
TIP: You can also add a couple text boxes containing messages and use custom animation to make it so that whenever they click somewhere the messages pop up
DOWNSIDE: If you aim your mouse at the "start" button the slide advancement settings will show and most people will then know what has happened