About 10 years ago, the place I was working at bought an old, reportedly rebuilt machine that puts IC chips into printed circuit boards. Computer controlled, High speed monster about the size of a '56 Buick.
Nobody, the people who sold it or the factory that made it could get it to run right for more than 4 hours. After a real bad day, I decided to pick up a 24" pair of channel lock pliers and shook it at the Beast. The damn thing started running again all by it self. Other than normal service and wear items the thing ran good if I threatened it every day with the pliers. Four years later it put in over 10,000 parts in an 8 hour shift, with out a miss. then we unplugged it to make room for the new one. You go figure.
Two years later, It showed up at a rebuild place I was contracting out of, They couldn't get it to run worth a damn. I told them to part out the Beast, they did so in a heartbeat. Revenge is mine.