After Granny takes a cab home and gets charged for the ride, she decides that it is time for her to learn how to drive. As she is, the taxi driver who took Granny home is still trying to collect the fair, but after a series of events, begins to believe that he is in a mental hospital. Granny, during her lesson, mistakenly gets on the road, but is pulled off the street by a police officer after her concerned family and Drysdale and Jane ask for an escort to bring her home safely. When Granny, Jethro, and the cop arrive at the mansion, the cabbie tells the officer what the mansion really is, and Granny promises not to drive. But soon Jed and Drysdale hear a car starting, but when they run outside, it is only Skipper, Elly May's chimp.