Put tape over the optical sensor of someone's mouse.
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Hide all of the desktop icons on someone's computer and replace the monitor's wallpaper with a screen-shot of their desktop.
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Install the Blue Screen of Death screen-saver on someone's computer.
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Pull on a coworker is to press ctrl+print screen on their workstation, then paste it into Paint, save the pic, and set it as the desktop background.
Move all of their icons to the trash.
When they get back to their desk, clicking won't accomplish anything!
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To understand what recursion is, you must first understand recursion.
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Take a squirt gun into the rest room stall next to someone and shoot little drops over the wall every couple of seconds while pretending to pee.
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Find a sleeping person, fill their hand with shaving cream and then tickle their nose.
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What do rabbits put in their computers?
Hoppy disks.
Change the coffee in the office coffee maker to decaf.
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April doesn't fool Chuck Norris, Chuck Norris fools April.
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A man was in his front yard mowing grass when his attractive blonde female neighbor came out of the house and went straight to the mail box.
She opened it, slammed it shut, and stormed back in the house.
A little later she came out of her house and again went to the mail box and again opened it, then slammed it shut again.
Angrily, back into the house she went.
As the man was getting ready to edge the lawn, here she came out again, marched to the mail box, opened it and then slammed it closed harder than ever.
Puzzled by her actions the man asked her, “Is something wrong?”
To which she replied, “There certainly is! My stupid computer keeps giving me a message saying, “YOU’VE GOT MAIL!”