Wow---people seem to get really up-in-arms about this! I like to keep the refrigerator pretty streamlined, so I go through it, write things on the list that are almost empty, and chuck things that are empty. I don't think "oh man my boyfriend is driving me mad by sabotaging the refrigerator!" It's just normal household wear and tear. If he opens a carton of orange juice while there's still another half-full one, I'll offer everybody glasses of orange juice until they can be consolidated. No biggies.