I don't worry when in Europe, but I had the scare of my life in Omaha, Nebraska. Yes, Omaha.
Downtown in full daylight on a work day a guy pushed me very hard up against the front of a building and unzipped his pants.
I was rescued by a private security guard who was walking along the sidewalk.
I had plenty of bruises and rattled nerves after that.
Omaha....of all places!