The scene is the last PFA Rally at Cranfield. Hero pilot (me) jumps in aircraft and for the benefit of the "anorak" directly in front of the prop (complete with binocs, airband radio and notebook) I yell "Clear Prop". "What" he replies "Clear Prop" I reply "What" he replies. "F..k off you dozy b.....D" "Oh right" and he moved. Perhaps the great unwashed don't understand the terminology?