Tech fan Noah Zerkin got a surprise when he rode the New York City subway last night: a brief chat with Google co-founder Sergey Brin, who was wearing what looks to be a new model of the Google Glass augmented reality headset.

Posting a picture of Brin on his Twitter account, Zerkin (@noazark), a self-confessed wearable computing and augmented reality enthusiast commented, "Yeeeah... I just had a brief conversation with the most powerful man in the world. On the downtown 3 train. Nice guy."

He followed it up with a picture of himself in the Vuzix Smart Glasses M100 taken, we suspect - given the Marvell lanyard around his neck - at CES 2013. "I wish I'd been wearing this. Now that would've been a great scene," he posted.

However, Zerkin has highlighted one problem Brin may have faced. Google Glass works best when coupled with a wireless internet connection to search for information or use location details to aggregate relevant data.

"I'd bet that even Mr Brin has to deal with being offline on the NYC subway," he said.

Pic: Noah Zerkin