Introduction: A few words on senseless destruction -- Populism and property destruction, 1790-1890 -- Modern education and its discontents, 1890-1930 -- Diagnosing delinquency, 1930-1960 -- Vandalism and the security state, 1960-2000 -- Books and boredom -- Desks and nostalgia -- Walls and the taboo -- Windows and euphoria -- Shards -- Epilogue: Reflections on unruliness and education