Keep your left hand back (unless you are one of those rare people with your heart on the wrong side).
Especially if you wear a wedding band!
dude, the heart is in the middle of your chest.
Anybody care to explain the downvotes on this one? I mean the poster isn't technically correct, but a constructive and informative response might include why that actually matters in the scenario under discussion.
I mean, we're talking about an organ that runs off of millivolts. Surely the heart is close enough to the middle when we're talking about running 120 or 240 volts of AC through it?
The Alanis Morissette method; I've got one hand in my pocket, and the other's probing a live circuit.