Blowing Into Cartridges

The NES's zero-insertion-force cartridge slot was genius for usability but terrible for durability; dust accumulated on the metal contacts and caused the infamous flashing-screen death. Kids and adults alike discovered that blowing across the contacts before reinserting the cartridge seemed to fix the problem. In reality, the actual fix was simply reseating the cartridge and remaking the electrical connection—the moment the game flickered back to life, the human brain locked in a memory of blowing as the cure, creating an unshakeable confirmation bias that persisted through the SNES and N64 eras.

Nintendo officially knew better and warned against it ("Do not blow into your Game Paks"), even selling an official NES Cleaning Kit as an alternative. But blowing became folklore. Breath moisture could even corrode the pins over time, making the "cure" subtly harmful—and yet nobody stopped. It remains one of gaming's most stubborn and beloved urban legends.