We’ve all heard those legends about travellers who crack bomb jokes in the security check line-up, and then find themselves face-down on the floor with a metal detector between their thighs. Paul Chambers, a 26-year-old Brit who was worried about snow storms delaying his flight to Ireland out of Doncaster, England, has a digital twist on the same story. “Robin Hood airport is closed,” he wrote last week in a tweet meant to tickle his friends. “You’ve got a week and a bit to get your sh– together, otherwise I’m blowing the airport sky high!!” A week later, the cops arrested him and charged him under the Terrorism Act, after questioning him for seven hours. Apparently, he had to explain the concept of Twitter to them.