I yell this over here in France, and I dont care if Im looked at either, thats the point of it. Seems to cross the language barrier because Ive heard it yelled at les Aeroclubs Francaise too -though maybe by Brits
What is the French for "Clear Prop!!" anyway, 'Attention/Guarder l'helice'? I dont know and have never thought to ask, I just rely on the yell bit to get people looking the right way prior to start.
Regards, SD..