I have a very plain dulcit Irish Accent...Im from higher middle class part of dublin so for those of you who know will be able to tell for yourself.
But the other morning on approach to LHR some american passenger asked me for directions through the terminal for a connecting flight.
As soon as I finished explaining "Flight Connections" he siddenly stopped me, shouting at me saying that he could not understand me and demanded that I SPEAK AMERICAN!!! I just laughed at him and said he would have major problems in Scotland (thats where he was traveling to) if he didnt understand me!!!!