Even as drunken student antics go, it was, by any stretch of the imagination, a disturbing scene. Surrounded by cheering rugby players, applauded by fellow members of the university netball team, 19-year-old Melissa Fontaine tipped back her head and giggled as fellow drinkers in the Students' Union bar pulled apart her eyelids and allowed them to pour a shot of vodka into her left eye. 'Vodka eyeballing', as it is known in student circles, is the latest drinking craze to sweep through Britain's universities.