A little fella walks into a bar. Unfortunately there is a pile of dog shit just inside the door, and he slips in it and falls over. He gets up, cleans himself up and walks to the bar and buys a drink.
A great big man then enters the bar. He slips in the same pile of shit, falls, gets up, cleans up and buys a drink.
The little guy turns to the big guy and, trying to strike up a conversation, points to the pile by the door and says,
“I just did that.”
The big guy punches him in the mouth.
Teacher: “What is actually used as a conductor of electricity?
Teacher: “Wire is right. Very good. Now tell me, what is the
unit of electrical power?”
Johnny: “The what?”
Teacher: “That’s absolutely correct, the watt. Now class, you
should all study diligently, like Johnny here.”