I once ate a pack of dry supernoodles because I really wanted some breakfast and was running late for a lecture.
I often have cold baked beans with barbeque sauce and parmesan cheese. Eaten straight out the can, naturally. Despite the criticism of my flatmates this actually tastes really good thus it gets eaten alot.
Actually I eat a lot of canned food cold because I can't be bothered to microwave it / wait for it to be microwaved. Cold canned ravioli, spaghetti hoops and tomato soup are a regular occurance. Vegatable soup cold was a definite bad decision though. I blame Leeds Festival for my tolerance of cold canned food.
My latest lazy food has been a load of chopped up potatoes, thrown in the oven with oil and then covered with barbeque sauce. It sounds marginally normal, but I don't bother to cut them into any recognisable shape and they generally turn out pretty messy.