I agree AnadY, the most practical gadget here is the call for assistance. It serves an important need. The other three gadgets have value and they're all impressive as homemade products, but the call of assistance was created to improve someone's life. That said, the crock pot was also developed to improve someone's life. The bike proves out the ability to manage fluids, and the camera is nothing but amazing in the creation of its own parts.
Okay, now this is a difficult task. All these creations are freakish. That said, if I absolutely had to make a decision, this would be my least start from the least freakish to the absolute gadget freak in this group; A gadget's call for assistance, the analog camera from 3D parts, the programmable crock pot and Mr shock with his bike. But that's just me.
Transfers the control of a large number of motion axes from one numerical control kernel to another within a CNC system, using multiple NCKs, and enables implement control schemes for virtually any type of machine tool.
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