Parent 2: It's not his fault he's a packrat, his parents died and he was in an orphanage in China
Parent 1: Why the hell is he here then?
Parent 2: I don't know but my kid's wearing long sleeves from now on
2) A person who can not throw away anything that, in their mind has value of any kind, and so begin meticulously filing away, in the style of the pack rat found in nature.
3) A species of rodent
2)Everyone knows a person who can't throw junk away, they're pack rats.