Also see this article on The Collared Sheep:
The best part of the day, aside from when you get to leave to go home, is when you get to leave to go to lunch. Bosses often try to ruin this by scheduling lunch meetings, or as they call it “a working lunch.” A working lunch means that instead of scarfing Chipotle, you're choking down something from a place called Apple Spice Junction and surrounded by pit stains. Bosses don't mind working through lunch because a) they are able to survive on a diet of cocaine and energy drinks, and b) they have no life. Never do you run into your boss at Starbucks reading a book or updating his Facebook status. If bosses had Facebook statuses they would say, “Having a working lunch.”
For the rest of us, that one hour plus round trip drive time allows us to clear our minds of corporate bile and do a little something for ourselves. If there's a restaurant located immediately outside your office, don’t go there unless you want to commit relaxation suicide. Nothing sours a lunch faster than spotting a co-worker at another table. If they’re sitting with somebody else, you may stand a chance. But what if they’re just chewing and staring straight ahead? Depending on how much food they have left on their plate and whether or not they hold a management position in the company, it is probably worth it to just chuck your lunch and buy a new one somewhere else.
The second part of lunch begins when you return to the office parking lot. If a favorite song comes on the radio, sit and listen to it for as long as possible. If a song that is sort of okay comes on the radio, sit and listen to it for as long as possible. Check your Twitter app. Floss. This is called "multi-tasking" and is valued by employers. And, depending on the layout of your building, multi-tasking involves parking far enough away to avoid being seen by those inside having a working lunch.