Snowball

In Arthur, D.W. comes across a Snowball that she keeps in the Reed's freezer. She loves and cares for the Snowball, and then it suddenly dissapears. No one is sure what really happened to the Snowball, but D.W. is sure that Arthur had something to do with it. This starts off a re-occuring theme in Arthur episodes, such as....

S1-E22: "D.W.'s Snow Mystery"

There are alot more, but I don't have time to get them all on here now. Please help if you can, and I will come back to edit as soon as possible.