Microsoft's Twitter AI experiment -- Tay -- briefly came back online this morning. Tay was initially switched off, after learning the hard way that, basically, we're all terrible people, and cannot be trusted to guide even a virtual teenage mind. This morning, however, it looks like Microsoft temporarily flipped the switch, activating the account again. It didn't take long before the Artificial Intelligence got itself in a bit of bother, by tweeting at itself, and instantly replying. The result? An infinite loop of telling itself "You are too fast, please take a rest..." Within minutes, Tay was offline again. Or rather, the account has now been made private.