Learn To Make Your Own Taser
This clip from electrical enthusiast Mehdi Sadaghdar shows the steps and components needed to create a taser, all while throwing safety precaution to the wind. The process is demonstrated in the shockingly painful way that Sadaghdar's YouTube videos are known for.
Further info explaining the circuit design and items used for the taser can be found at Mehdi's site ElectroBoom.