Oh, I do that with the kitchen in work. Fortunately, my office is right by the kitchen, so I listen and lurk to make sure no one's in there before I get my lunch out of the fridge.

And the WORST is when I have a frozen meal to heat up, because what if someone comes in while my stuff is in the microwave and wants to talk to me?? (I actually go back to my office and leave the door open so I can hear the microwave beep when it's done.)