The Mona Lisa has been left shaken but unharmed after a visitor to the Louvre tried to smash the glass protecting the world’s most famous painting before smearing a cake across its surface in an apparent climate-related publicity stunt.

The perpetrator was a man disguised as an elderly woman who jumped out of a wheelchair before attacking the glass on Sunday.

“Maybe this is just nuts to me … ” posted the author of a video of the incident’s aftermath that shows a Louvre worker cleaning the glass. “[He] then proceeds to smear cake on the glass, and throws roses everywhere before being tackled by security.”