Here is an example of what happens when one person doesn't park right. It's a chain effect. This was taken in a parking lot of an office building that has some government offices in it. Lovely Eh?
The black pickup truck parked almost on the line, therefore the red car's driver obviously did not want to get close to the truck so he/she decided that they would park a little farther over, screwing everyone else up in the process. Of course the smart thing would have been not to try to park next to the red car in the first place and just skip to the next spot. Apparently some people aren't smart enough to have that kind of common sense.