Whitney Museum of American Art

The Jeff Koons exhibit at the Whitney Museum in Manhattan was hit by a graffiti vandal last night, who was caught on video spray-painting a wall in front of dozens of startled patrons. Christopher Johnson, 33, of Manhattan, was arrested at the museum after he was accosted by security guards and turned over to police, according to reports. Fortunately, the focus of the exhibit, Koons’ “Hanging Heart” sculpture, and other works were not harmed,...