“It was warm in the summer of 1945; the windows were always open and the screens were not very good. One day the Mark II stopped when a relay failed. They finally found the cause of the failure: inside one of the relays, beaten to death by the contacts, was a moth. The operator carefully fished it out with tweezers, taped it in the logbook, and wrote under it “first actual bug found.”

“It was warm in the summer of 1945; the windows were always open and the screens were not very good. One day the Mark II stopped when a relay failed. They finally found the cause of the failure: inside one of the relays, beaten to death by the contacts, was a moth. The operator carefully fished it out with tweezers, taped it in the logbook, and wrote under it “first actual bug found.”

— Kathleen Broome Williams