As the boy turns to walk away, he catches his right foot of the painting’s modern display stand. Realising the drink he's clutching poses a serious risk to the 350-year-old canvas, manages to keep it upright - but in doing so he plants his right hand through the painting.
The damaged painting is a Paolo Porpora impression of flowers, oil on canvas, now with a fist sized hole it it.
Oops. Well, teenagers gonna teenage. Good thing the work is insured.