Blowing in NES cartridges in the hope it makes them work.

Realizing that didn't work very well. Opening the NES. Adjusting the internal connector to press the contacts more firmly. Cutting a pin on an IC (and them maybe pulling it high? I don't remember) to disable the copy protection pin – one less pin to have connection issues.

…still having to blow in NES cartridges and hoping it somehow makes them work.