I have been working on a storage trailer that has a roll up door. I put a 40" walkin door and tined in the rest of the opening.I left the old door in place till it was done. Today i was cutting the old door up and i was down to the last 3 sections. I got one side out and as i was takeing the other side out it folded up and hit me just above the upper lip. It left a 1" cut and rolled the skin down. Just before it happen i was thinking about doing stuff all by my self. I was very lucky it could have been realy bad. It gave me a good scare.