Yeah, I'm not sure what vote ones anyone else has touched, but i'm pretty sure the only ones in public areas are small ones made for shocking cows so they don't smash out of the field.
Actually, I once broke a camcorder by leading on a electric fence whilst carrying it. It was funny watching the tape afterwards though.
Some guy standing in a field -to- me saying 'ow! what the..' -to- a loud fussing noise and the picture going completely white. ;D