Except when absolutely necessary (like to get the tow bar connected)
you shouldn't be turning the prop at all. There's no good reason to
justify the dangers.

Partly, just to be a smart-ass, and also looking at the geometry, that could
be one of the worst times to turn the prop...


In reality, as already pointed out, that is one of the times when it could
be necessary. At the very least, I would verify that all controls
(especially throttle and mixture) are all the way back and that all
appropriate switches are off--and then try to stay out of the prop arc while
working. That should minimize the personal danger and (hopefully) eliminate
the possibility of one of those "Voracious Airplane Eats Tractor" type
accidents that circulate forever on the internet.

Peter