Here's a Twitter hashtag we loved recently: #FictionalDeathsIWillNeverGet Over. Because really, who hasn't felt keen mourning for a person or animal who only lived onscreen? The classic ones are famous -- Bambi's mom, Old Yeller, the horse Artax from "Neverending Story." And this year, "Downton Abbey" has given us two unbelievable deaths -- new mom Lady Sybil and new dad Matthew Crawley.