The guy at the Akron surplus store told me my joystick repair was a fire hazard, and he was right
Picked up a beat-up CH Flightstick from a flea market in Akron for $8 back in March. The trigger button was dead so I did the lazy thing and soldered a jumper straight across the contacts, no resistor, nothing. It worked great for maybe two weeks. Then I brought it into a surplus electronics shop on Kenmore Blvd to hunt for a new cable, and the older guy behind the counter took one look at my solder job and said flat out, "That's gonna melt your board, son." I laughed it off until he pulled out a multimeter and showed me the draw was pulling almost double what the port could handle. He sold me a 50 cent resistor and about ten minutes of his time explaining why the factory had one there in the first place. Lesson cost me less than a dollar but it stung worse than if I'd fried the whole thing. Now I actually read the schematic before I bridge anything. Anybody else got a story about a random shop guy catching your worst hack before it blew up?