I remember those people well.
There's the passive aggressive "Oh dear, I thought I put that bread over here, but now it's getting run over by cans! I'll just move it back."
As for the bread and eggs, I had a man ream me once because his eggs were ruined last time. I apologized and asked what had happened. Apparently, upon reaching his home, he had just dropped the bag with the bread in it into the freezer without unpacking the loaf. Because he hadn't known the eggs were under the bread, they were dropped into the freezer too and therefore froze and were useless.
It was all I could do to not ask him "Did you really think a loaf of bread weighed that much? And who tosses groceries into the freezer without unpacking the bag anyhow?" but I did not. I simply asked him to be sure to remind us in the future if he needs certain things separate, as we bag certain things together and get into a habit we might not remember he has a special preference.