>Whilst I confess that I'm neither German nor from Berlin, I do believe 
that in the Berlin vernacular a "Berliner" is a type of sausage.<

No.

It is really a jelly filled 'donut' - but without the hole. 

OK. I am in the mood to debunk it again now.

The urban legend part about this is that the citizens of Berlin laughed at
JFK for saying the famous sentence.

There is a certain ambiguity about what he said, but language always is.
And it was most definitely NOT an incorrect way of saying it, i.e "I'm also
a citizen of Berlin". His speech writer was fluent in German, after all, it
was't JFK who came up with that line.  There was no mistake, period. 

And the Berliners didn't laugh, they cheered. Because they understood him
very well.

m