A litte example:...
Overweight Products at the Supermarket
Carla bought four packages of pre-packaged meat at the supermarket. When she got home, she noticed that although they had the same weight on the label, some looked larger than others, so she weighed them again. Packaged meat in supermarkets sometimes weighed less than the label.
One day, she went to the supermarket butcher and asked them to weigh the meat directly. While she waited, she noticed that the person labeling the pre-packaged meats would toss the meat onto the scale and immediately print the label.
At that moment, she wondered: Could it be that when you toss the meat onto the scale, the momentum makes the weight higher? Her hypothesis was: "If you wait for the scale to stabilize, the weight will be more accurate."
To test her hypothesis, she went to the packaged meats shelf and asked the butcher to reweigh them. To the butcher's horror, all the packages were overweight. He tried to apologize, but Carla explained that the problem was that, in order to get the job done as quickly as possible, her assistant would throw the pieces of meat onto the scale, which would immediately print the label. The solution was to wait a minute or two for the scale to stabilize before printing the label.