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Place a “Please honk if you like chocolate” sign on the back of your spouses’ or co-worker’s car.
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Lightly tape a plastic bug to the inside of a lamp shade.
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On a Windows computer, press the Ctrl, Alt, and downward arrow key to flip the display screen upside down. (You can turn it back by pushing Ctrl, Alt, and the upward arrow key.)
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After placing coffee grounds inside the toilet tank and flushing a few times, the resultant brown water will get everyone’s attention at home or in the office.
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Stuff toilet paper in the toe of your kids’ or spouse’s shoes, and see how long it takes for them to figure out what’s going on.
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Make up a few well-crafted, authentic-looking parking tickets on the computer, print them on heavy-duty stock and place them on cars of your neighbors who live on the same street.
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Unscrew the cap on the shampoo or body wash containers in your home and place a small piece of plastic wrap over the bottle opening before screwing the lid back on.
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Replace one of the family photos on a table or wall with a computer printout of one of your favorite comedian.
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Remove the batteries from the TV remote.
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Unscrew the shower head in the kid’s bathroom and put a whole or piece of a chicken bouillon cube in the shower head. (Make sure you have Teflon pipe tape in the house to put things back together properly.)
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Take a bag each of Skittles, M&Ms and Reese’s Pieces and mix them together and dump them into the same serving bowl. Leave just one of the empty candy bags close by. (Be careful of any food allergies.)
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Make up some posters to put in grocery stores advertising a contest. Use your friend’s cellphone number and offer people a $100 prize for the best Chewbacca noise.