I never really like seeing people walking near moving props. 3 or 4 years ago I was pre-flighting a rental and a Cirrus fired up across the ramp from me. I watched as they attempted to go, but were held back by a tie-down chain (hello pre-flight, anyone???). Don't quite remember if it was a passerby or someone from the plane, but the chain was removed, with the engine running, by the person going to the forward part of the wing. I watched wondering if he might trip and fall into the prop arc.
