Corresponding author: Here is a submission that we hope will be published in your journal.

Me: No thanks. [supplies rejection letter]

[Ten months go by.]

Same corresponding author: Here is a new submission that we hope will be published in your journal.

Me: No thanks. This is the exact same thing that you gave us [some time] ago. We actually rejected this before, under [date] and [manuscript number], so we cannot consider it again.

Sometimes authors submit the exact same thing again because they forgot that they submitted it the first time. And sometimes authors try to sneak stuff by us. >_>