Threes company: when the ropers left. Moonlighting: Dave and Maddie did it. Brady Bunch: Cousin Oliver arrives Friends: Day one Melrose Place: Sydney left, and the show became all about Jack Wagner and Lisa Rinna Game of Thrones: Season 7 premiere when the writing dumbed down so much it became about fan service and CGI dragons ER: Carter goes to Africa and returns with the rejected writing staff of Grey's anatomy Monk: Sharona leaves and is replaced with a more boring and annoying character

I have watched a lot of tv.