Electrickery A****y style

A previous owner should be forbidden to touch any electrics. This lamp was playing up. Can you guess why?

And no, engineer Jansen did not unscrew the wires. This is how it came off of the wall.

How did they manage to tighten those screws in the first place, with wires this short?? Ah, they didn't, probably. See the burnt wires.

Hm, I now think they wired the socket first, and then put cement around it. Sounds like him.