Archive photo of students at the University of Birmingham throwing their mortarboards in the air – the traditional celebration at the end of a graduation ceremony. See SWNS story SWCAPS; Killjoy university chiefs have taken the fun out of graduation by banning students from throwing mortarboards into the air – for fear of health and safety. Cleverclogs students at the top British uni have been told they are not allowed to throw their black caps in the air in celebration in case the falling hats cause injuries. he University of Birmingham students, set to get graduate later this summer, were told they could be ejected from the ceremony if they are seen following the academic tradition. The poorly written email told students: Throwing of caps is not be permitted, due to health and safety.