Planescape Torment Trailers and Ending
Easy to argue as the best D&D game ever created, Planescape: Torment was one of the few games in the franchise (as with Baulder's Gate) to have great game play and tell an awesome story without letting the D&D rules clutter things up (see D&D Online). Sadly, though, I never completed the game. At about 20 hours in I decided it'd be fun to try and kill someone I needed to talk to... thus throwing an insurmountable roadblock in the path of the main plot. So, it was cool to see what's touted as the game's ending on Youtube (though it seems a bit short and would have probably meant more to me 8 years ago). A few trailers for the game, while a bit dated, also bring back some good plane-walking, tanar'ri-trouncing times. And then, of course, there's the Lady of Pain... doing what she does.
Trailer 1
Trailer 2
Ending
The Lady of Pain






My favorite RPG of all time. The story and dialogue is the best there's ever been, but I don't think the gameplay holds up today, sadly.