When I stutter, my mind goes haywire and I have trouble thinking. It really does affect more than just the speech. It's not like when I'm stuttering that my mind feels calm and collected like I am when not talking. Something more is wrong than just the speech sounds not coming out right. The caveat to this is that it only happens when stuttering. And yeah, driving can be dangerous when I'm blocking really bad. Interesting to know that it's not just me.