Some years ago I was working in a company, one product was ten year old, 50,000 units sold and one day came a report from the field that a product recently sold was not working properly. I looked into the code and easily found the bug. All the process of finding and fixing the bug took less than an hour. The question is how it was possible that in a ten years old products and 50,000 sold, this bug was never found before? The product in question was an elevator up to 32 floors and the bug happened above the 16th floor. The answer was very simple, within the 50,000 units sold no one has purchased an elevator with more than 16 floors until one day was sold one for 20 floors.........

Stupidity also evolves!