I just read Jonti's entry about Carston and how he goes into "Mockney" when he's talking to him.
I found this quite interesting.
This could be something Dawn could do, people who do this always apologise when called up about it.
"Sorry it's just something I do, I just pick up people accents straight away, I can't help it"
It might be true of these type of people but it always still feel like they're mock mimicing.
I think this could be funny.
If anyone wants to throw some ideas about with this drop me a line or chat about it on here.