Many, many years ago as a younger lad, I watched my friend change the oil in his Chevy pickup. It was parked in the garage and we'd enjoyed a few cold ones watching football or something (it was 1975). He carefully managed to put 6 quarts in without spilling an ounce.
A few minutes later after carefully wiping off the fill cap and cleaning up the valve covers, he walked around to start the truck and immediately slipped and fell to the floor in a puddle of brand new 10/40 Pennzoil on his concrete garage floor. Those darn oil pan plugs.....