Surprise Package

The view from my desk last night:

"Hmm," says Wendy. "There's something inside this box!"

"I wonder what's in there.... 

Did Evil Mommy get me fluffy balls and mousies?"

Bertie, looking on, replies, "Most certainly, my dear!"

"I'll just remove some of this paper," says Wendy. 
"Eeek! Aaack!"  FLUFF TAIL!  RUN AWAY!

'Twas the wily Possum, as Bertie had known all along.