It's common knowledge that Skyrim, although great, is a broken mess of a game from a programming standpoint, with a seemingly neverending list of bugs. That's understandable since the game is so bloody massive, but... well, I just ran into one that completely prevented me from watching a climactic cutscene about three quarters of the way through the main questline.
What you're supposed to do is read one of the eponymous Elder Scrolls at a specific location, then watch a five-minute flashback, immediately followed by a boss fight. At least that's what's SUPPOSED to happen. Instead, as the flashback begins, I see some dude run past me, I hear a dragon roar, and that's it. I can't move. At all. Can't hear anything either. I can stand there for ten minutes, NOTHING. I tried a few "fixes" that apparently worked for other people, but they didn't work, presumably because those fixes are for ANOTHER bug later on in the flashback. (Wow, such stellar programmers you have there.)
So I had to watch the flashback on YouTube, then instead of reading the Elder Scroll, input a few commands in the console that would allow me to skip the flashback and go straight to the boss fight, while still learning the boss' weakness in the process (the entire point of the flashback being to teach you that weakness). Fortunately I was playing the one version of the game (PC) that has the console, but I don't want to imagine a PS3 or 360 player running into the same issue and being completely locked out of finishing the main questline as a result.
Still. A game not working properly and forcing me to watch an important scene on YouTube is something that's never happened to me, and probably will never happen again.