New cure for hangover? Don't try this at home

I came across this in the letters page of New Scientist  magazine

“Shocking Discovery
From (name with held)
When I was an apprentice electrician many years ago, my fingers strayed across live positive and negative terminals, and I cursed myself for being so careless. However, I suddenly realized that my raging hangover had vanished.
Given how well the voltage cure has worked for some (New Scientist, 22 February, p34), I now believe that the shock is what obliterated my hangover. I never dared to shock myself again deliberately in order to test my hypothesis.”
Albion, Victoria, Australia