Heisenberg was driving with Schrodinger on a car trip when they got pulled over. The police officer asked them if they knew how fast they were going and Heisenberg says "No, but I know where I am." The cop says "You were going 120km/hr." Heisenberg responds "Great, now I'm lost!"

The cop, suspicious of this answer, searched the car and said "Sir, did you know there's a dead cat in the car?" Schrodinger replied "Now I do!"