Sometimes we don't take the warning "fire hazard" seriously enough. Why should we? It's quite rare we actually come face to face with the devastating fires we see in the movies. But these dudes working to unload a polystyrene truck quickly found out why their cargo might be deemed "flammable material."
It's unclear exactly what causes the top of the truck to ignite, but some commenters pointed to power lines in the background as a possible culprit. Good old-fashioned friction from the rope might have also caused the spark.
The flames start ridiculously fast! Hopefully nobody was hurt.