When I start to stutter I do it kn the vowels. So much that I caught my self trying to think to other words just to not start a phrase with vowel. And if in Italian there are only 5 vowels, in English it could be a fucking nightmare because there are a lot more vowels. For example the 5 Ws. I know "W" is not a vowel, but in my mind "what" is "uoot". And when I'm nervous i cannot start a phrase with any fucking vowel.