While I don’t love them, I think these commercials are pretty effective at planting the thought of using Siri for common tasks. Habits are hard to break, and if Siri is going to be successful, they’re going to have to be broken. Many people naturally want to emulate movie stars (or in this case, a famous director), even if it’s only a subconscious desire.
These ads would be a million times more effective if Siri was a bit more ready for prime-time. It’s just not yet. Hopefully iOS 6 brings that.