How not to unload a truck...
No video, but I had a guy do something similar to that with a forklift and a boxcar a bunch of years ago. He went charging up a ramp into the boxcar and then discovered the forklift didn't have any brakes!
We right out the door on the other side of the boxcar and ended up with the forks stuck straight down into the dirt.
Sure wish I had a video of that!