Bob the electrician hired a new assistant, who is picking up the job as he follows his boss around. He is puzzled by Bob's method of testing for mains voltage. Bob wets his finger, stands on one leg, and touches the wire. One day Bob stayed home and left his assistant to finish some jobs. Not sure whether the blue wire is live or not, the young apprentice wets his finger, stands on one leg and touches it....
The next day Bob goes to visit his employee in hospital where he is recovering from the shock.
What happened?" asks Bob.
"I was testing for power, just like you do."
"Did you wet your finger?"
"I did."
"Did you stand you stand on one leg?"
"I did."
"And" asks Bob,