This is a sombre topic: I was wondering if this story is possible(electrocution)

[Gyro]

Much as I hate to dredge up one of these threads, I just had to post a link to DiodeGoneWild's latest teardown video.

The first one I've seen where the transformer has zero tape insulation between primary and secondary, not even a token attempt at meeting the isolation requirements! It uses cheap CCA wire too, just to increase the chances of overheating and insulation failure. Downright criminal! 

The transformer part starts at 11:45 if you don't want to watch the whole thing (he looks at two adapters).

[Terry Bites]

This why my submarine uses batteries.