[CamB]

Porsche

Was worried the 911 had leaked a considerable (rather than little bit) of oil over 3 months without use. Put a considerable (rather than a little) oil in the tank. Fired it up, made a LOT of smoke - and oil overflowed out the drain hole in the airbox and all over the engine then floor. Shut it down. Cleaned it up.

Ran the engine for 10 mins with the breather poking into an oil container. Decided that that was enough to puke the excess out. I removed the oil cap and started hunting around for the dipstick (I had taken it out earlier). Turned around to see oil puking out the oil filler and onto the engine and floor. Shut it down, cleaned it up.

BMW

Neglected to do final torque of rear wheels after putting car back on the ground. 80(!) miles from home, a knocking sounds started up in the left rear. Didn't have a wheel brace - had to borrow one from a passing car!!! Note this was on the way to a tarmac rallysprint!