Busy parking lots tend to be a surprisingly powerful window into someone’s character.
The means they use to find a spot and the choices they make when no one they know is watching, e.g. sneaking in ahead of someone who has clearly been waiting, are telling.
Double parking, parking on spaces designated for the people with disabilities, parking on pavements, parking on loading bays, parking on walk-ways etc.
PS: The same principle applies to parking your bicycle at the bicycle parking rack at university, putting your hand laguage in the overhead bin in a plane, or anywhere it is a first come first serve with others.