My very first night sort preflight in Memphis I was hit (more like brushed) in the arm by a tug train doing 20+ as I was looking up at the tail-cone. I was an inch from being crushed and that has set the tone for my preflights from then on. Here at the Cologne base, all of the F/O's have to wear the reflective vest for preflight (airport rules not FedEx) at every single European airport we fly from. The vest police keep a close watch and the fine can be as much as 50 euros.