Now this 'debate' is simply silly. There is no reason at all for not shouting a warning, and at least several reasons why it should always be done (even when you KNOW that you are absolutely alone on an empty airstrip. It's kind of like saluting when crossing the deserted brow of a ship in the middle of the night ... a good habit to get into).
I do not feel at all self-concious about shouting "clear prop!" ("stand clear!" also makes sense to me, dmjw01). No one has ever made fun of me for this, but if they do I will just hand them my business card and say "keep this for reference when you get sued for killing someone: which will happen, sooner or later".
