The 10 Worst Programming Mistakes in History Code is almost everywhere. The advent of modern computers arrived in the 1940s. In its rich history, programming enabled better communication, and led to advancements across a myriad of industries. Everything from space travel to telecommunications and healthcare has been revolutionized and affected by code. Plus, programming can teach valuable life lessons . However, in its storied past, coding wrought destruction as well. Instances of a little bit of bad code caused disaster on a major level. The following are 10 of the worst programming mistakes in history. 1. Y2K Bug The Year 2000 bug, aka Y2K Bug or Millennium Bug, was a coding problem predicted to cause computer pandemonium. In the 90s, most computer programs listed four digit years in an abbreviated version. So 1990 read 90, 1991 written as 91, etc. By shortening four digit years to two digits, coders thus saved valuable memory. But computers were unable to recognize 2000