I thought I should add to the previous post by retelling a very odd experience with a film set in Sarajevo. I am not certain whether it was to do with the Richard Gere film "Spring Break in Bosnia". In any case, walking through Bascarscija one evening I discovered that the whole central area was blocked by film crews, actors, lights, cameras and so forth. Those passing by had to squeeze around the edges of the scene and push through past the crew and actors, as did I in an attempt to keep going on my route that night. As I followed behind some EU peacekeepers in uniform, one of the crew members asked the men in front of me whether they were the "real ones" (presumably otherwise they would be "fake ones", also known as "the actors").
Definitely an "Underground" moment.