Oh my god, that's a good one!
I've seen similar contraptions before though - only in my case a) it was a copper water pipe, b) a proper earth clamp, just a number too large and c) they didn't use a clothes peg but some sheet copper. Oh yes, and they managed to loose the terminal screw, so the just squeezed the wire between clamp and pipe. After roughly 40 years of use behind the bathroom tiles everathing was thoroughly corroded - thanks heaven it didn't supply anything real dangerous - just a wall heater that was out of reach and had an isolated pull chain switch.
