The Mona Lisa came under a “cake” attack on Sunday after a male visitor masquerading as a wheelchair-bound granny hurled a slice of “gateau” at the world’s best-known painting. Leonardo Da Vinci’s masterpiece was undamaged in the incident at the Louvre, as it is protected behind a thick, glass case. The unnamed man said afterwards that he had carried out the stunt to raise awareness about the state of “the planet”.