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By Unknown
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It can follow light sources via adaptive motor orientation, which may not seem that impressive, but let me reiterate: 10 dollars.

Via: Instructables
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It's the only spray bottle that works on a roller coaster. Why you would want a spray bottle on a roller coaster, I don't know. I'm not one to judge, though.

Via: Seuntjie
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  1. Connect the one end of the relay coil to the collector of the transistor.
  2. Connect the other end of the coil to +V end of the power source.
  3. Connect your resistor and LDR to the base of the transistor.
  4. Connect the resistor to +V and the LDR to ground.
  5. Connect the emitter to ground.
  6. ????
  7. PROFIT!!!!
By Unknown
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..For every room in my house. ~Not-So-Handy Andy