One from an ex-colleague, his worst job was doing some wiring work in the nosebay of a Phantom, primarily because the best way to assemble the p clip afterwards was to superglue the washer to his finger. Once assembled he would pull a couple of layers of skin off his finger, but at least he could get everything in the right place.
Mine was trying to find a laser snag on a Tornado after I'd left the mob and become a civvy. We were called in as the "experts", turned out the only physical fault was a cable screen had come loose but the "noise" on the cable was now being interpreted as a laser range by the software which was giving every indication that the laser was firing when it wasn't.
Dave Parry: serves you right for being an Instie. At least the Comms kit was somewhere out of the rain and wind....