It's a shame thing. A lot of people will see the foreclosure papers and slide right into a state of fullblown denial, subconsciously feeling very ashamed about not being able to keep the roof over their head. Instead, they pretend nothing is happening and that "things will come around". Then the day comes they get kicked out of their house, and things still don't settle in proper and they think "well we'll come back and pack our things later".
Then when everything gets taken and dumped in a landfill, you'll see the nervous breakdowns or complete manic episodes that follow.
@Useless Warrior: If I were you, I'd actually pack your parents' stuff for them, and drag them off whether they like it or not; they'll thank you for it later