Heisenberg was driving his new Mercedes when he was pulled over by a police officer. “Do you know how fast you were going?” asked the officer.
"No, but I know exactly where I am," replied Heisenberg.
"You little smartass," said the officer, beating the snot out of Heisenberg with the butt of his Luger.
"How long will this beating last?" asked Heisenberg.
"I don’t know, but I know exactly how much energy I’m expending," said the officer.