Yes I was shown a video loop of military ground crew who bent down on one leg head towards an intake to remove a nosewheel chock - may have been a Phantom, possibly a Harrier, I wasn't trying to ID the aircraft - he bent down and got sucked in all in one fluid movement ... in he went, head first, and survived. Word was that his helmet made contact with the blades but he was ok ... as 00 says, the image tends to stick in the mind and is heeded for life.