Moscow traffic ground to a halt when a giant advertising screen above a main road south of the Kremlin began showing a pornographic video.

A 40-year-old unemployed computer expert had hacked the server of the company that screens the commercials. The prankster was traced by police and arrested. He said he only wanted to “give people a laugh”, but Russian TV reports that one elderly driver didn't appreciate the joke. He was so shocked by the sex film he had a heart attack at the wheel.