In addition to those that Airbedane mentions (although I still haven't been introduced to Grandad Biggles, Ladyanorak or Margo yet) I had a number of people walk up to me and ask the question "do you Prune?" Those included
Koliber
Dusty_B
Phoenix09
StevenPJ
Just try walking up to someone and asking if they Prune (at an airfield that is - I dont suggest you do this at your local Tescos), if they say yes bingo, if not so someone you dont know now thinks your mad
Would like more info about a Proone badge, better still how about personalised PPrune clothing?