Desktop barometer and thermometer that uses the principles of buoyancy and air pressure. The thermomether (left) uses the principle invented by Gallileo in which the appropriate floating weight tells the temperature. The barometer (right) is a world mapamundi with fine etched continents. Price: Less than $25
Mirror Optical Illusion Prank that involves identical bathrooms and twins

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Pretty cool prank
This for sure involved a lot of effort, I can't imagine the amount of time that it took to take down the dividing wall put the glass. The twins also made the ilusion pretty real.