A bizarre video has emerged from Austria of a Bosnian taekwondo champion using his head to smash 90 concrete (siporex) slabs in just 25 seconds.<br /><br />In the unusual clip, which was filmed on June 10, Kerim Ahmedspahic somersaults into each pile of slabs and headbutts them hard, driving a crack right down the middle.<br /><br />The filmer claimed that the feat was a new Guinness World Record.
