April Fools idea:
On every board, have a random list of "corrections" that display at the top of the board. For example, on /a/ we'd have "Madoka reported Kyubey to intergalactic authorities, where he was arrested for violating child labor laws and sentenced to 20 years in jail. Madoka became a successful executive and has three children, Homura now works as a hotel cleaning lady in Shanghai." You don't just do it for shows, but for anything. Like /an/ would have various animal facts corrected, noting how delicious endangered turtle meat is or the healing properties of ground up dinosaur bones.