My accents change with my mood.
I have well - American. Northern and Southern of the USA.
Then, I also have Scottish. Usually when I get really upset, my format of speech will change as well.
British. I'm distinctively formal when I use my British accent, it means I'm somewhere between indifference and being upset or pissed, but not showing it. This accent usually comes before my Scottish one.
French. I mix it in with just about everything, since I say specified French words.
And look out if I start talking in multi tongues and accents, because I'm in a mood then and not a good one.