Ugo Ungaza Villegas’ vandalism alerted Louvre workers that the glass case surrounding the “Mona Lisa” was obviously not strong enough to keep future vandals out. Notably, the Bolivian’s stone broke through and still had enough force to damage the painting at the portrait’s left elbow, which was subsequently painted over. The protective casing shielded the painting on at least two further occasions after its eventful year in 1956. In 1976, when the painting was on loan to the Tokyo National Museum, a disabled woman sprayed red paint on the case to protest an ableist policy that refused disabled people from viewing the masterpiece (via the Sarasota Herald-Tribune).

The most recent attack on the world’s most famous painting came in 2009 when an unnamed Russian visitor threw a ceramic mug at the “Mona Lisa.” The culprit was reportedly upset over being refused French citizenship (via The Guardian). The mug, which was apparently bought at the Louvre’s gift shop, shattered against the bulletproof glass case. The case was so strong that the floor merely had to be swept, and the viewing room wasn’t even closed after the attempted vandal was apprehended. No one else has tried to damage the masterpiece in the years since, although the painting’s global popularity certainly makes it a target.