OH CCL! What a bad day you've been having! I don't have any suggesttions to offer... only sympathy.

Scrappy seems to be aptly named - he's a feisty little devil! And from what you've said, apparently scared and over-stimualted. He also probably knows that he doesn't have to be constantly caged anymore... he knows he's home and doesn't want to spend another second in a cage. He had lived in a cage for the past few months, so now that he's home he doesn't understand why he has to be in one. I'm sure he knows there are fellow cats running freely, and is wondering why he's got to continue being in a cage. It can only get better, right?