There are certain things you can bring through the Green Glass Door, and certain things you can't. For example:
Eggs but not bacon.
Books but not novels.
Bees but not wasps.
If you're not familiar with the rules of the game, see if you can figure them out. If you are, list one thing you can take through the door, and one thing that isn't allowed.
I'll start us off:
I'm taking my Rabbit but not my guinea pig.