What's that tree doing in the house?

This is the first year I've seen a tree inside the house!  Momma must not have put one up last year since I was a little rascal.

I was really intrigued when she put that angel on top.  Then came all the other ornaments.

I've been such a good boy though.  I peer over at the dangling things every now and then but haven't chewed up any of them yet!