This happens to me not very often but often enough that my friends aren't surprised or shocked when it happens. I'm 14 and have had a stutter pretty much my whole life. Blockages usually happen to me in school like if I have to talk in front of the class or give a presentation I just freeze because I physically cannot say what I was going to. Because of this I get laughed at a lot and people always seem to mock me for my stutter,but where I'm from this is just considered 'messing' so I have to laugh along with them and not say anything or else I'll be called a snitch if I tell someone or a whingebag if I get upset and nobody will talk to me.(I've seen this happen with other kids,not for a stutter but because of reporting bullying to a teacher and other reasons like this)