Professor Ferenc Szasz argued that so-called rap battles, where two or more performers trade elaborate insults, derive from the ancient Caledonian art of "flyting". According to the theory, Scottish slave owners took the tradition with them to the United States, where it was adopted and developed by slaves, emerging many years later as rap. Professor Szasz is convinced there is a clear link between this tradition for settling scores in Scotland and rap battles, which were famously portrayed in Eminem's 2002 movie 8 Mile. He said: "The Scots have a lengthy tradition of flyting - intense verbal jousting, often laced...