You blew inside your Nintendo cartridge to get it to work.
There’s no denying the original Nintendo Entertainment System was the best. However, it also had its quirks. One big issue was the video games didn’t always work right. People thought dust was the problem. So, they blew really hard inside the cartridges to get all the dust-out. Except, we learned later dust wasn’t a problem at all and the system just had a design flaw.