AAAAAAAAAAAAAAAAAAAAAAAAAAAAAGH! FFS!! :'( :'( At first nothing. Thought - what's the fuss - then I did it right
It works like this..... the aluminium sheet and the metal in your fillings form the plates of a battery with your spit as the electrolyte. The pressure of the bite adds the the electrical potential giving you a right old shock. I did it for a bet - never, ever a fookin agean.