I have just been pranked.

I've just fallen for an April Fool's Joke. Gmail bragged about the new AutoPilot feature, which emails back realistic responses based on the user's personal emailing style. Gullible as I am (and also because of the fact I'd forgotten it was April Fool's day 11 minutes ago) I believed it and futilely searched for the AutoPilot setup page. I wanted it to be real, too, because that's an ingeneous idea.