The first thing that amazed me was that Google understood what I meant by vidyarthi bhavan! Note vidyarthi bhavan is a generic phrase in many Indian languages which just means 'student building.' In Bangalore, it refers to a specific restaurant in Gandhi Bazar famed for its masala dosas. And I bet there are plenty of people who live in Bangalore right now and don't know about this restaurant. The contextual knowledge here is amazing. And it wasn't just geolocation, I was about 15km away from Gandhi Bazar at that point. And Bangaloreans will know corresponds to an eternity given the traffic situation. And the software did all this by recognizing a phrase consisting of two words, both of which are not in English!
That moment was an epiphany for me, it the precise moment that I realized that personal digital assistants are here, and they actually work.