In a striking moment that would become legendary in computing lore, a moth was found lodged in a relay of the Harvard Mark II computer. The Harvard Mark II, also known as the IBM Automatic Sequence Controlled Calculator, was an early electromechanical computer developed to assist in complex calculations. Grace Hopper, a pioneering computer scientist and U.S. Navy rear admiral, was a part of the team working with this machine. During routine checks, her colleagues encountered an operational issue, which they traced back to the presence of the moth. The discovery was meticulously noted in the logbook by Hopper's team, marking it as the first known instance of a computer bug, a term that would become widely used in the field of computer science.This incident not only provided a lighthearted anecdote but also foreshadowed the complexities and challenges that would come with the evolution of computer technology. As computers became more integral to various fields, the importance of debugging processes became clearer. The note featuring the moth was preserved and remains a lasting testament to the early days of computing.