I did a "cringe prop" once - we had the crew entrance door on our C-130E "strapped" shut (don't ask), and were doing an engines running quick drop-off of a part (at Langley, I think); I went out the ramp-and-door, and two civilians were already at the crew entrance door, expecting me there; one of them saw me, nodded, and turned to walk back - through the turning number 2 prop! I threw up my hands in the international "No! Don't!" signal, but he just hesitated, confused, but looked to be continuing his move toward me; I spun around and hunkered, to avoid the shower of blood, bone, and brains, and that clued him in. Trick of lighting, I guess, and him not used to being around props much. . .
There used to be a sign in a hangar at Norton AFB - "If you never walk through a prop arc, you'll never be hit by a prop" - if I recall we had a couple T-29s there, but everything else was jet (C-141As, Sabreliners, etc.)