The only way to keep players from doing something stupid is to Just Keep Talking.
Sadly, there is no way to keep the DM from doing something stupid, although offing one of his favorite NPCs might shut him up for a couple of minutes.
Joker's Last Laugh
Did you anticipate the big plot twist of Batman: Arkham City? Here's all the ways the game hid that secret from you while also rubbing your nose in it.
Charging More for a Worse Product
No, game prices don't "need" to go up. That's not how supply and demand works. Instead, the publishers need to be smarter about where they spend their money.
The Dumbest Cutscene
This is it. This is the dumbest cutscene ever created for a AAA game. It's so bad it's simultaneously hilarious and painful. This is "The Room" of video game cutscenes.
Silent Hill Origins
Here is a long look at a game that tries to live up to a big legacy and fails hilariously.
Bethesda felt the need to jam a morality system into Fallout 3, and they blew it. Good and evil make no sense and the moral compass points sideways.