I usually stutter when I'm expected to talk. Like when I'm in a group of friends or a meeting at work and everyone looks at me because i said something like, "Oh I have an idea". They'll look at me expecting me to expand on it and every single eyeball is trained on me, the room is silent, everyone with that look on their face like, "Yes, what's your idea, c'mon". Then I get stressed out. That and talking to strangers in public.