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1.
When a mechanic has no ability to troubleshoot a problem. Instead shoots the "parts cannon" at the problem. He ends up replacing every component in the system in hopes of fixing whatever was causing the problem. A complete waste of material and labor.
Customer: My breaks are squeaking.
Dumb Mechanic: You need new brake calipers, pads, rotors and wheel bearings. FIRE THE PARTS CANNON!
by flying June 30, 2012