I'm genuinely amazed he's not been found burned to a crisp in his workspace. The same goes for Photonic Induction, how he's not burned down his street, let alone his house is a miracle:

https://www.youtube.com/user/Photonvids/videos

That's how you know he actually knows what he's doing: he knows precisely how to shock himself for comedic effect without causing any damage.

This, most of the dangerous mistakes are just gags.

IIRC Mehdi admitted on reddit that the one time he really screwed up and was genuinely scared was when the Jacob's Ladder fell on him[0].

[0] - https://youtu.be/lT3vGaOLWqE?t=467

He also has a nice playlist[0] called 'ElectroBOOM101' where he teaches the basics.

[0]: https://www.youtube.com/playlist?list=PLr_CZLgMkHeWFl1uf5yR2...