will be ineffective. A few reasons:
1) if you hold the device in just one hand, most of the current will only pass through your hand. If you connect one terminal with one hand, and another terminal with the other, it will run straight through your chest, and your heart
2) In modern countries, there are often voltage switches that automatically flip the circuit if they detect too much current has gone to ground. These are designed to act within the speed of "one heartbeat", potentially saving your life. However, I don't know whether a sub-par nation like Spain has such a thing
