Recently they warned readers: Beware of dangerous stalactites (that is, frozen sludgecicles) falling from frozen overpasses. Falling ice can be a problem, and not just on overpasses. Many buildings here have slanted roofs from which snow and ice will eventually slide off and fall to the sidewalk. If you are walking by at this time, cover your head! It reminds me of that FarSide cartoon where you see things from a "bird's-eye view" and all the people walking around down below have targets on the tops of their heads. You never know what's going to fall out of the sky. Wheelbarrows, for example. Or more realistically, old bricks and pieces of rocks. There is an old church in the center of Olomouc (another Moravian city) that has had signs on its walls since 2004 warning pedestrians of "falling remains."