Maybe this guy's handicap is being empathetically challenged.

If the thought of a person with mobility issues being inconvenienced (possibly dangerously so) doesn't do it, and the fear of a hefty municipal fine doesn't do it, maybe the possibility that a group of angry strangers will cover your car in a bajillion blue and white post-it notes will keep you from parking your car in a handicap parking space. Maybe. However, if you're the kind of person who doesn't care about the first two outcomes, then maybe you won't be too concerned by the last outcome either. Though, judging from the perturbed reaction from the illegal parker in this video from Maringá, Brazil, that last one seems to do the trick.

Sources: Apple OS X | h/t Digg