Packratness

Why do we do this to ourselves?
I tried to be ruthless with my belongings when I was packing this last Autumn, utterly ruthless, I tell you. I took SIX carloads to the Goodwill - SIX of them, for crying out loud, and I have a big hurkin' station-wagon, not a Honda... Why is it then that every time I unpack another box, I *still* end up pulling things out and kind of looking at them like...
"Huh? What did I pack *this* for?" (toss)