Rodents of Unusual Size This is the ultimate twist ending. Rod Serling could crap out a better ending than most Hollywood directors now could ever dream of doing. (looking your way, Shyamalan)
Bort Nahh, the ultimate twist ending was probably "Time Enough at Last". People who have never actually seen the episode and summarize it as "there's this guy who loves books and there's a war and everyone dies and he finds a lot of books to read and he breaks his glasses" have no idea what made the episode work: Serling fakes the viewer out as to where he's going with Burgess Meredith's character. He was married to a shrewish woman whom he nonetheless loved; he worked at a job where he wasn't respected but nonetheless tried to get along with everyone; and when nuclear war struck his biggest worry was loneliness, not lack of reading material. So when he finds the library, you think THAT is the twist ending -- that perhaps this poor likeable guy will discover he's happier alone after all -- and then the glasses break.
Burgess Meredith starred in four TZ episodes. The only other actor to tie him was Klug Man.
Smellvin I called the ending about five minutes in. Do I win some sort of trophy or ribbon?