This is my Wilderness First Aid professor Steve. We were studying shock, and without warning, he put a bag tightly over his head and tried to get the girl in the front to take his pulse and feel it change as he was deprived of oxygen. He has complained on numerous occasions about things the administration will no longer let him do, I'm not sure how this slid under their radar. Professor standing at front of lecture hall or classroom has a plastic bag over his head while he breathes in and out.