you do realize blowing on the cartridge works just as good as not walking under the ladder and avoiding black cats? As a matter of a fact it contributes to connector oxidation (moisture in your breath).
The actual trick is to stick the game in, and after you push it down, you then slide it with your finger to the left or right about a half-centimeter to align the pins correctly, hit reset, and it's good.
It's not great for it in the long term, though, but hardly as damaging as much of the smug internet would want people to believe.
Guess what happens as a side effect of blowing in the cartridge?