I keep opened jams and sauces in my fridge, and my stepmother did that right from the day she moved in to my our home when I was ten so I've grown up seeing that. Apart from that it's pretty normal stuff I'd say, spreads, cheese, cold meat, milk, bread etc. There are often eye drops in there but that's the only thing most people would consider odd. I think I'd need a bigger fridge/freezer if there were more of us but I've never, I don't think, needed one of the massive ones that are available today.