Could be a video or magazine ad or whatever. What are your favorites?
I'll start:
Mother: No crying until the ending. Masterpiece guaranteed.
Playstation: Double life. Still find this to be one of the best.
Star Wars Rogue Leader: GC commercial. De graphics blew me away at the time. The Rogue Squadron III commercials with Ackbar were also good, but too short.
Bonus: From one of my favourite games.