If you work in an office, and there are more people than just you working in that office, chances are you have some sort of lunchroom, with a shared refrigerator and microwave. Sometimes, you might see a toaster oven in the mix.
It's not a problem where I work, from all that I hear, but there are plenty of offices where people steal food from the lunchroom. Just Google (don't Bing, unless you want to hear Mr Crosby groan a number for you) "office lunchroom stolen food" and you will see 49,500 entries on the topic. Theft prevention tips always range from putting a coating of really hot pepper sauce on the food and leaving it in an inviting position in the Kelvinator. For this, you would want to use a Scotch bonnet pepper sauce. I have a bottle at home of something called "Smokin' Tonsils" hot sauce, and I am here to tell you, one drop on a porkchop will make your eyes water and your mouth sizzle and the top of your head commence to twitchin'. I love it! But that's one way to go. There are other adulterants that can be added to food for fun effect, and then other people suggest microcameras and booby traps to catch the thief.
And then there is the problem, not of people taking stuff out of the 'frig, but of people putting stuff in there and leaving it there until the milk turns to cheese and a peach starts to look like a mongoose. A very hairy mongoose, at that.
And then there is always the guy who takes all the ice out of the ice tray, and then puts the empty ice tray back in the freezer. So along comes someone who needs to ice down his Fresca, and there's no ice.
You may be certain that the people who do this sort of stuff at work are the people who will try to make a right turn from the center lane on their way home from work, and try to butt up ahead of you at the deli counter at the Shop 'n' Bag, and blow smoke in your face as you walk past the designated smoking area.
You want to get angry, but I go with pity - they have to live with themselves, and that can't be fun!