The man who defaced Rothko's 1958 work 'Black on Maroon' now claims he has added value to the painting. While that's probably a bit of a stretch, his actions are certainly not the most outrageous example of vandalism in art history.
A list on Ranker from January this year includes the case of a drunk woman who wiped her bare bottom on a painting by Clyfford Still valued at $40m and the 47-year-old Italian man who took a hammer to Michaelangelo's David back in 1991.
Perhaps the most endangered painting in the world is Leonardo Da Vinci's Mona Lisa. Over the years it has been attacked with acid, a rock, red spray paint and a cup of tea.