The Evil Mad Scientist's Sawed-Off USB Key project is perfect for a rainy afternoon: It's cheap, easy and you probably have all the parts you need lying around the house or office. The project page has a detailed step-by-step, but you can probably guess how it is made: You just hack off the end of a USB cable, slit open the plug and slide in the internals of a USB stick. It looks cool, and has obvious prank-appeal.
Here in Berlin it's raining (again), so I'm off now to hunt through my junk box and make one of these.
Project page [Evil Mad Scientist via Make]
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