There are people hacking billboards and posting their own subvertisements (https://en.wikipedia.org/wiki/Subvertising https://en.wikipedia.org/wiki/Subvertising

There are people hacking billboards and posting their own subvertisements (https://en.wikipedia.org/wiki/Subvertising https://en.wikipedia.org/wiki/Subvertising). A while ago, I came across this 20 min mini-doc about the movement in London: https://www.youtube.com/watch?v=zunPa9rGndg https://www.youtube.com/watch?v=zunPa9rGndg I think you might enjoy it