Shop safety

I learned that lesson many years back, the door to my shop had a regular glass window in it. Late one night I heard breaking glass, went out to see the glass on the outside of the door. I heard the air hose flopping around when I got to the door. The end of the hose beat the crap out of my brand new (three days old) stacked tool box. I don't ever leave the chucks in air hoses these days