Working on P-3's in the late 90's, the frequency of the props in ground idle coupled with the aircraft strobes at night would give the illusion of all four prop discs being stationary.
After a particularly protracted period of night exercises, upon taxing in, we watched a ground handler drive the tug and GPU to a position in front of no. 3. The groundie then proceeded to drag the power lead through the props to the ground power plug. Fire handles we're pulled, but far to late to be effective. As luck would have it, the groundie passed between the fuse and no. 3 prop disc, and was none the wiser until surrounded by very excited ground and flight crew.
The lesson?, fatigue, complacency and illusions are killers.