The video you linked shows a garage door opener that has been installed upside down. This is a dangerous and potentially fatal error, as the door could fall on someone and crush them.If you are thinking about installing a garage door opener yourself, it is important to make sure that you do your research and follow the manufacturer's instructions carefully. Hiring a qualified professional is always the best option, as they will be able to ensure that the opener is installed correctly and safely.Here are some of the dangers of installing a garage door opener upside down: The door could fall on someone and crush them. The door could become jammed and trap someone inside the garage.* The door could open unexpectedly and damage property or injure someone.If you see a garage door opener that has been installed upside down, it is important to report it to the homeowner or landlord immediately. Do not attempt to use the door until it has been repaired by a qualified professional. Flag for review