A (late) friend of mine who used to run a car repair business told me how he changed an engine in a car once and was just down the pit finishing off on the exhaust when the owner came around to see progress.
'Are you nearly finished?' he asked, 'nearly done, just got to fill the engine with oil' said the voice from the pit.
'Shall I start to put it in?' said the owner. 'OK' said my friend.
After a short while a voice from above said 'I can only get a pint in'. 'Hang on a minute and I'll be with you' said my friend.
My friend came up out of the pit and ----!!!!------!!!!!!!
he'd poured the oil down the carburetor!!!!!!!!!!!!