You Can't Plug in a 2 with a 6

Green Acres

It's planting time in Hooterville and Oliver is shocked that the locals make their crop choices based on aches and pains. Back on the farm, Oliver assigns every electrical device a number from one to seven in an effort to keep their creaky generator from blowing. All gadgets up to a total of seven can be plugged in at the same time, but Lisa can't quite grasp the concept.