McD hired Stefan Szwed-Stronzynski to change the chalk billboard twice daily. The idea is that cafés and restaurants change their chalk billboard as their menu changes, and since McD's serves fresh food too, so can they. Fresh croissants, yes we haz that. Warsaw office of DDB and art studio Good Looking and Krewcy Krawcy Productions set this up.
McDonald's Chalkboard Menu - Changes twice a day - (2013) Poland