During the 1970s, the United States experienced shortages of many items, such as gasoline and rasins. Famous talk show host Johnny Carson once said "You know what's disappearing from the supermarket shelves? Toilet paper. There is an acute shortage of toilet paper in the United States" That did it! The next day many of the 20 million viewers ran to the stores and bought all of the toilet paper they could find. By noon, most of the stores were completely out.
Although Carson explained on his next show that it all had been a joke and apologized, people still saw empty shelves in the store and panicked. Scott Paper Company ran a video advertisement showing their plants at full steam, but it didn't help. Scott Paper did not mind much, though, because they sold more toilet paper that day than for the next two months!
It took three weeks before the shelves were restocked. The shortage was finally over, and remains the only shortage ever caused by a single consumer.