I never stutter when I'm angry?

I never stutter when I'm angry? When I get pissed, I'm pretty damn articulate with whatever it is that I'm saying and my speech rate is rapid. Usually talking fast is never a good idea for me. I remember in hs during a presentation one time I messed it up pretty bad and got laughed at. My next presentation I did well because I went in there serious, and slightly pissed that I was laughed at last time. Plus wasn't there a scene in the kings speech when the pathologist pissed him off, and his words were suddenly clear?