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.
Final Fantasy X
A game about the ghost of an underwater football player who travels through time to save the world from a tick that controls kaiju satan. Really.
Resident Evil 4
Who is this imbecile and why is he wandering around Europe unsupervised?
Fixing Match 3
For one of the most popular casual games in existence, Match 3 is actually really broken. Until one developer fixed it.
Grand Theft Railroad
Grand Theft Auto is a lousy, cheating jerk of a game.
Starcraft: Bot Fight
Let's do some scripting to make the Starcraft AI fight itself, and see how smart it is. Or isn't.