Can you run coffee through the maker a second time

That was the search phrase from someone on the Boston University domain today. It gave me a great idea: create a new tag for these posts for "crazy coffee questions". I guess this could be a starving student; how else would you explain a question like this? What's the intention of brewing a pot of coffee and then running the coffee through the machine a second time? To extract the last mg of caffeine from the beans? To reheat the coffee, perhaps? Or is it simply a science experiment? Any other suggestions? Post them here with a comment.