Here's an old one. Take a screenshot of their normal desktop with no windows opened or anything like that. Then delete all of their desktop icons and hide the taskbar. Change the background to the screenshot you took, and watch them try and figure out why they can't do anything.
Also, I heard about this one, but I don't know how well it would work. Open up the earpiece and the mouthpiece to the phone and fill them up with something heavy like coins or something. Leave it there for about a week or so. Afterwards, take them out. The next time they answer the phone, hopefully they will smack themselves in the face.
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