Here a guerilla campaign in Stockholm from The Economist (see picture). The message is targeted at the commuters who pouring into Stockholm city in the morning – tired bankers staring on the ground on their way to the office.
No, the copy is not written at the zebra crossing. The agency, Crowd, has washed up the words from the dirty street with a pressure washer and a template. Smart but despite this, the local authority claims (in Swedish) The Economist can be engaged in vandalism (The City Hall of Stockholm has zero tolerans on graffitti).