When I was a kid we liked to make peanut butter and jam sandwiches, using leftover pancakes for the bread.
I also (as a kid) liked to make sandwiches with white bread and refried beans, or white bread and leftover spaghetti.
We used to break up leftover cornbread, sprinkle sugar on it, and pour milk on it--like cereal. Same with leftover rice.
I still like to pour very hot baked beans on top of very cold cottage cheese and eat them together.
I never knew for a long time that my mom did the same thing I did when we had baked country style ribs, sauerkraut, baby peas, and mashed potatoes. I like to eat the sauerkraut with the meat, of course, but I also like to take a big bite of mashed potatoes with sauerkraut. My mom and I were surprised to find out we both did the same thing.