Reminds me of visiting the New York area ATC setup in about 1974 when myself and the crew had some time to spare there. They did us proud and showed us round the whole set up. Towards the end our Captain said to our host that there was one GMC at Kennedy who talked so fast we could hardly understand him. The host controller said that he knew exactly who we were talking about as he had recently been on a famil flight with one of the local airlines sitting in the jumpseat and how embarassing it was. The skipper gave him a headset and said "You're an air traffic controller - you tell me what this guy is saying!" It was a B727 with three crew and the skipper points to the engineer and says "He gets some of it" then pointing to the FO "He gets a little bit more and then I get a bit and we just try and piece it all together!"