When you try to talk seriously to someone and they act like you're playing because you don't sound like you used to. I was born and raised in the deep South (with everything that implies of Southern ladies) so I can't even be impolite with telling people to knock it off because I'm serious. Even worse than that, though, is the fact that I lost the ability to assimilate accents according to the people I talk to. I used to be able to talk to someone for 30 minutes or so and perfect their accent which was very helpful in making anyone feel more comfortable and relaxed because I sounded like them. Now I can't do that anymore.