Today I learned the famous "first computer bug" was an actual moth. In 1947, operators of the Harvard Mark II computer found a moth stuck in a relay. They taped it into the logbook with the note "First actual case of bug being found."
that logbook page is in the collection of the Smithsonian's National Museum of American History. but here's the twist: the joke works because engineers already called glitches "bugs". the word is much older, used in engineering since at least the 1800s. the moth just made it literal.