At the risk of drifting the thread slightly I recently relayed on 121.5 for a helicopter VERY close to the edge of the LHR zone. He had been caught out by grot weather and was trapped in a valley unsure of what to do. Two local airfields had no VDF facility and by pure luck I knew the valley he was in (based at the same airfield) I'd like to say a big thank you to the gentleman from the Netherlands who from a position west of Ireland kept on telling me I was on guard, and in doing so kept trampling on communications between myself and D&D and a very frightened low time PPL who couldn't hear D&D due to his altitude.
Gentleman in the helo landed safely in a field. Gentleman in the 747, have you no idea what "for relay PAN PAN, PAN PAN, PAN PAN" means you idiot?
A call of "you're on guard" is on thing. trying to start an argument in that situation is utterly stupid. I didn't swear at you on 121.5 but I certainly did over the intercom.