This is a quick prank you can do to your friends computer.
(This is my first 'ible so give me some constructive criticism)
Step 1: Take a picture
Make a picture of the desktop by hitting the "print screen" button and saving it with a photo editor.
Step 2: Set as wallpaper
Set the picture as your wallpaper.
Step 3: Disable icons
Now you need to hide the icons by right clicking the desktop and then go to view and uncheck the show icons button.
Step 4: Done
Now you're done.