Heisenberg and Schroedinger are driving together, but they get stopped by a police officer.

The officer asks, "Did you know you were driving at 75 mph?"

Heisenberg sighs, "Oh great, now we're lost."

The cop is unhappy, and checks the car's trunk. He asks, "And why is there a dead cat in here?"

Schroedinger grumbles, "Well there is NOW!"