Saw something like that years ago but with 55 gallon drum. Someone was pouring out the contents of polyester resin into gallon jugs. When the drum was not pouring anymore, he decided to shine a light inside to be sure it was empty. Oh, but he didn’t have a light so he used lighter which he proceeded to drop inside while he was looking. The results was sound of a jet engine and flame like that shooting out of the bung hole. Had the building it was in not have been solid poured concrete, the place would have went up in seconds.
One of the other guys there was crazy strong, fire plug, ex navy vet who ran over grabbed the drum with his bear forearms and threw it out the back. I wish I could say that was dumbest thing I saw the resin pouring guy do, but I could write a book on this guy.