This isn't particularly hazardous for a typical residential door. However, I would NOT recommend average Joe doing this on anything over an 8x12 door, or a door

This isn't particularly hazardous for a typical residential door. However, I would NOT recommend average Joe doing this on anything over an 8x12 door, or a door with glass windows. I've seen people thrown and bars explosively hurled on heavy doors (with heavy springs) during unexpected failures/incidents.