There's a group of people doing them theatre exercises, they rent a hall down the corridor from me periodically. I've always known there was something really fishy about them. Are you saying they might be scientologists? Becuase that would really fit to the group's MO.
I was being flip before: there are real differences, primarily in the role of teachers (in theater they should never hold real power over you) and suppression vs. expression of emotion (theater exercises are often about how to feel more, whereas scientology is about brainwashing into feeling less). However, self-hypnosis, presences and detailed mental examinations are shared by both.