Just had a safety meeting with our guys. This was brought up about being under a load. That is the worst place to be. Don't ever trust anything that has been lifted.
Thankfully I haven't seen this in particular, but did see a guy get knocked off a trailer when it was being unloaded by an overhead crane. It knocked him to the ground and he got crushed underneath a bunch of steel. He was hurt pretty bad.
You can never be too careful when it comes to things like this.