Maybe pay a little bit of attention next time.
Anyone who has ever worked on trucks can tell you that a lot of the components aren't exactly precision engineered, and that some days a sledgehammer is the tool you use the most. Anyone who has worked a lot with heavy machinery will tell you that small things going wrong can cause big problems, and that is indeed what we'll see here. A crane operator is seen lifting a container off a semi trailer when part of the trailer doesn't come free.
The whole truck comes up with the container, and although the truck driver is seen waving his arms, the operator just keeps on going.