Sufficiently Advanced has showcased some amazing inventions on their YouTube channel in the past. Their Punch Activated Arm Flamethrowers are pretty fun too. As Allen Pan explains, these flamethrowers allow you to shoot from your fists when you throw a punch.
More gadgets like this: here
You are going to need an Arduino Pro Mini, a triple-axis accelerometer, and a bit of code to program these smart arm mounted flamethrowers.
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