It depends on the session and what is has involved. Sometimes I leave on a high if I feel a big sense of achievement, or I've had a really affirming talk with my T. I don't think I have ever left a session visibly upset, because I'm sure my T wouldn't want to part with unresolved issues that couldn't be carried over until next time. I have probably put on a brave face frequently though, and then cried after I get home.