Luigi first appeared in Nintendo's 1983 arcade game Mario Bros. as Mario's younger brother, and his timid, easily startled personality became a defining part of the character in later Mario games. Short clips of his panicked vocal reactions circulate online because they sum up that personality in a second. Creators lift the oh out of gameplay footage and reuse it as a universal reaction for bad luck and surprise, which is why it keeps appearing in gaming edits, meme compilations and short vertical videos far beyond its original context.