When you plug a Macbook in with the included two-prong power adapter, sometimes it buzzes slightly when you stroke it gently (ground loop). Im working with a factory to make a grounded duckhead adapter to fix this.
Now since you're in this area of expertise, do you think it's possible that on rare occasions I could lightly stroke another human (let's say in a bed, on a waterbed (water filled rubber container)) and feel the same sensation as I feel sometimes when I stroke the computer? Could be that both turn me on, but I'm pretty sure this was not imagined. It was also rare and strong when it happened.
It's totally possible for this path to ground to go through two humans, making it feel like their skin is buzzing! For example, if your friend is in bed using a Macbook, they're insulated from ground and thus at Macbook case voltage. If you stand on the ground beside them and touch them, the current now finds a path to ground through both your bodies!
So, my guess is you're using the 2 pronged brick (US) plug with a US->EU plug adaptor.
Despite how dangerous it sounds, I've never heard of anyone having a real shock... so I guess it's fine.
https://www.apple.com/uk/shop/product/MKU63B/A/67w-usb-c-pow...
Had a few times where I've had to disconnect the charger as I could feel an effect like static electricity on the metal case of the MacBook.
https://apple.stackexchange.com/questions/17575/how-to-prope...
Alright if I sell any of this North American grounded version, I'll make one for y'all across the pond!