Writing and taking over a character

Does that ever happen to you? You write a scene in which one particular character features and take on their mannerisms? I've been writing a fairly long scene featuring Mad-Eye Moody, who does a lot of grumbling and growling, and I caught myself doing just that.
I wonder what would happen if I started writing a vampire story *shudder*.

Without Magic

Chapter II "Summertime - But The Living Ain't Easy" is now up at The Petulant Poetess:
http://www.thepetulantpoetess.com/viewstory.php?sid=1506&i=1&PHPSESSID=b9af5fdf489a3353d1123727401db0c7
Yeah, I'm wearing that grin of the Cheshire Cat right now... Four reviews, before I even knew it was up! What can I say...
Currently, Chapter 3 stands at 4.2k words, and I haven't even gotten to the point where his Royal Highness features, which I promised for that chapter. *sigh* On the other hand, I'm enjoying a noisy music session right now *feral_grin*