Many people change their vocabulary and behavior according to where they are and who is around them, the company they’re in. I do this too. I’m not going to tell a professor that she’s spewing bullshit, though I might if I were addressing a drunk bastard around a bonfire. This is not to say that I wouldn’t confront the professor, but I would use more polite terms. In addition to the behavioral changes that I and others experience, depending on who’s around us, I experience another change which I suspect is fairly uncommon: the ease with which I speak. if I’m in the company of people who I’m comfortable with, than talking is as easily done as it’s said. In these situations, talking is effortless and feels the way it should, natural. When I’m around other people, including most friends, speech is much harder. I lose my ability to speak my mind. Whatever I want to say is quickly scrutinized by some self-conscious part of me and is usually rejected as unacceptable, or at least undergoes gross modifications, before the words can reach my mouth.