I was thinking about this as I tucked into my leftover lamb hotpot for my breakfast this morning what a 'studenty' thing I was doing. And then thought about all the things I used to eat at that time because I was skint/lazy.
Cold baked beans out of the tin after a night out.
Jacket potato and marmite
Dry bread
Pasta and ketchup
As a child my DP used to eat brown sauce sandwiches and raw potatoes out of a nearby field when there was no food in the house.