This should be a strong reminder of why people should have several months of food stashed up at home. I dont know what would cause a run on food like the run on guns, but it is pretty clear that if there ever is a run on food, its going to go fast and all of a sudden.
Imagine if for some reason transportation was limited. Whatever food got delivered would be taken by those lined up at the store before it opened and sold for hefty profits later.
The lesson is store up on things you dont want to do without.