It's not quite a historical event, more of a bit of trivia, but it seems to be common knowledge that it's possible to cheat at Duck Hunt by pointing the light gun at a light bulb, making it register a hit every time, often repeated as a sort of "look how far we've come, those silly game devs in the 80s missing such an obvious exploit."

Except it doesn't work. The light gun checks for a frame of darkness followed by a frame of light. If it picks up light when it's not supposed to, it counts it as a miss because it knows what you're pointing at isn't the screen at all. But people in all corners of the internet are absolutely convinced this trick was a thing for some reason.