I'd go back just to mess with them. Suddenly grip the chair and start making Hulk noises. "Oh god, ugh, I'm.. I'm going into a BIPOLAR RAGE!!!!" and then accidentally hit the overhead light into her face. "Oh gosh so sorry, that just happens from time to time. You never know when the BIPOLAR RAGE will strike. It's over, though, for now. You can go ahead and clean my teeth."