It only takes a few milliamps of electricity traveling though your heart to kill you. If you are playing with electricity and you know the lines are hot or you have not bothered to check, make sure that the electric path though your body is not though your heart.

And 110v shocks are not that uncommon, like OBG i have been hit more than i will admit to. It's enough to wake you up, it might be bad enough to make you say a dirty word. The shock that makes me really jump is once in a while i get zapped by the high frequency on the tig welder, that ranks up there with makes you squeal like a little girl. But even the high frequency is not bad unless i am well grounded. One of the showoff things that tig welders do is make sure that you are NOT grounded and turn the torch around in your hand and aim it at one of your fingers. Then touch the pedal, you can see the electricity dance between the torch and your finger. It feels like little pin pricks, and it makes for wide eyed engineers.