"The Man With Two Brains" (1983) starring Steve Martin and Kathleen Turner.
In this very funny scene, Dr. Michael Hfuhruhurr (Steve Martin) is driving his dead wife, Dolores Benedict (Kathleen Turner), to a castle in order to swap her brain for the brain-in-a-jar of the woman he now loves (watch the movie, it sorta makes sense). During his frantic driving, the police stop the doctor for speeding. The drunk test turns out to be quite hard.
"Dead? My God! I better get her to a cemetery right away."