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i think you've misunderstood. their mistake was not one of adding a lid, but of failing to open the can prior to heating.
they failed put a lid over the saucepan especially if someone use pressure cooker to make it.
the can clearly exploded. see robin's comment.
http://www.youtube.com/watch?v=CaD8FjKpi5w
I helped cleaned up a girlfriend's parent's kitchen once, in a rush before her parents came home because she had let a pot boil dry (and, for the record, it did not have a lid on).