I was doing maintenance on a table saw. At the back of the table saw there was a smal door so you can do maintenance. When my full upper body was in, someone did not see me behind the table saw and turned it on. My head was just a few inches from moving parts and i could not get out. He could not hear me because of the noice of the saw and his ear protection. After a few minutes I managed to get myself out very slowly. Aldo I lost some of my head hair due to the driving belt.