Re: Dutch-like language [OT]

Last night in the 80-metre band I heard two 'hams' talking.  The vowel
sounds of their voices seemed to be characteristically Dutch (an accent
like the Groningen area) but the language was completely
incomprehensible.  I listened for several minutes but didn't hear a
single word I recognised
 Do any of our Dutch contributors know of some dialect that is Dutch in
sound but does not use the standard Dutch language?
 [I tried to send this to Jan by e-mail but the address I found for him
on the Web just bounced.]