Robbie Williams has revealed that he and wife Ayda Field were threatened with being beheaded while doing charity work in Haiti.The singer visited the Caribbean country with Unicef after the 2010 earthquake which left an estimated 250,000 dead and 1.5 million people without homes.Recalling the scary incident on Field’s Postcards from the Edge podcast, Williams said: ‘I got threatened to be beheaded in Haiti.