As voracious consumers of media, we've seen it all: the good, the bad and the please-god-let-me-scrub-my-eyeballs-make-it-stop.
Hell hath no fury like a geek audience's disappointment when a beloved ______ [video game, book, movie] is translated into gawdawful ______ [movie, television series, comic book, etc.]. Sometimes it's the medium - The Watchmen simply wasn't going to work in any other format than illustrated serial narrative. Other times, it's the Hollywood egos. I may never forgive Brad Pitt for ruining the masterwork potential of World War Z.
Still other times, it's just the most royal clusterfuck you've ever had the misfortune of encountering. Stephen de Souza, the director of the lamentable Street Fighter: The Movie spills the beans about the making of a cinematic disaster.