@futurebird There was a brief fad for video ads in the back of taxis here in London several years ago. Didn't last long, they were hated so much that people would refuse to use taxis that had them.
On tube trains, there's been a long-standing practice that if they can't sell an advert they put up poetry instead. It's so popular that they then went on to sell hundreds of thousands of tie-in books of the poems. Which, I suppose, means the poems were adverts after all. I'm so confused! 