Nah. They get trained to be unimpressed.
Plus, these are people with the power to
lock me away. Not like I can trust them
or anything.
Guess it depends on what way you want to impress them. They get trained to be unimpressed by extremes of emotion, self-injury, etc., but they're human beings - they generally have some people they like to work with more than others, so if you set your mind to it, you can still suss them out. That said, I still ended up hiding a lot of my competence from my former shrink, on the paranoid fear that if he saw how well I could do under certain conditions, he would become convinced I didn't need help altogether and kick me out.
I hear you on the locking you away part though.