Lettuce was always the hardest for me a subway too lol. It comes complete sense. You don't stutter when you are by yourself, nor do you stutter when you talk alone with animals. But as soon as a human being is in your presence.. we stiffen up, and try not to look stupid. The value hold of other peoples opinions, or judgments is a very good indication of how much we will stutter. Learning to change the way we perceive judgements from others is massive. Do you have any experience with that ?