on my old car, I had a 3 hour drive to go some were so I thought better check and top up the oil, so checked and topped up the oil and cl osed the bonnet and off I went, was 1 1/2 hrs into my journey when I noticed some oil on the windscreen, stopped and got out to see oil all over the outside of the bonnet, opened it to see id left the oil filler cap between the inlet and the rocer cover, car was fine though. good old toyotas.
another on was whan I was changing a mani for a friend, i dropped a nut down the exhaust which went all the way to the middle box, so had to get under the car which was on axle stands to undo the exhaust to get the nut out.