3 incidents stick in mind for me:
1) University friends citroen AX gt, we had “stropped” cross country back to Uni like the tyres were on fire. Next morning, we got into it, he turned the steering wheel to pull out of the parking space, and the front left wheel fell off! (upright had completely shattered!)
2) My old range rover, broke the rear diff whilst off roading, thought, “I know, i’ll lock the centre diff and drive home on the front one”. Great plan, except for when you accelerate in a low gear with a fwd range rover, the front axle castor just unstoppably winds on full lock. Que exiting a roundabout 1 junction too early…….
3) Doing some DSC calibration for a manufacturer who must remain nameless in Northern Finland. Engineer in the UK emails me the “latest” dynamics controller .hex file to flash into the car. Unfortunately, he’d messed up, and had a -ve value in one of the yaw control maps. First time i touched the brake at about 100mph on a sheet ice track the car immediately span. Lost count after about the 25th spin. Ended up buried in a snow bank needing new underpants! 😉