Why Londoners are exchanging text messages with a signpost

About a year ago, a street artist known as Mobstr posted a video titled "The Number," which involved leaving a phone number posted on a roundabout, and inviting passersby to call the roundabout, and even receive followup text messages from the circular intersection itself. "Thank you doing everything that you do," says one caller.

Now, Mobstr has followed up with a second installment where Londoners are invited to call a signpost. Needless to say, many people do. Some of the people calling are drunk; all of them all calling a signpost.