You wouldn't guess it - a call centre! I was working for the Royal Bank of Scotland fresh out of uni and the guy behind me had a stutter. We stuttered like mofos on the phone everyday and it actually became worse whenever we spoke to each other. I think its because we were both trying to hide it but failing spectacularly and never acknowledging it in the open, which caused a self repeating cycle. Shows how toxic that feeling of shame can be. Apart from that I think one of my close college friends stuttered but he was covert. He was always quiet in class and spoke in a deeper, different voice when the teacher asked him questions. I hear he is a teacher now too. I never asked him if he stuttered but years later, looking back on it and recognising the patterns, I think he did.