Do I role play at lunch? To answer that question in a small, concise way... No I do not. I don't role play at lunch. However, I role play--with my friends--after classes are over. I am in college, and we don't really have a set "lunch time"... Everyone eats on their own time. There is a cafeteria, but it's hit or miss on whether you'll see somebody you know there (it's open almost constantly from seven in the morning until eight at night, and I go to a rather large campus), so I keep my nerd time to a minimum at meals.
But, like I said, this is only at meal times. My friends and I are constantly at each others' throats with our make-believe personas. Right now, I am the beautiful mystery girl called only by initials, "Elle Arre," the one who is doomed to meet the Phantom Rogue in every life. This time around, he is the Crown Prince of a small but outrageously prosperous kingdom blessed with the name "Enbax". An oracle told his parents of his soul's identity at birth, but they quieted her with money, only telling him now that he has come of age. He is meant to marry the eldest daughter of a powerful foreign baron, one who is the closest living male relative of the king of his nation. The Crown Prince (who so far doesn't have a name) is meant to thus eventually unite the two neighboring kingdoms, vastly expanding the size of the territory under the Crown's control, and elevate their economy to another level.
The (main) characters in this so far are Elle Arre, the leader of the street gang she encounters on her way to the prince, the prince, his fiancée, the king, and a character that hasn't done much that affects my plot-line yet (because we set up one person to be a sort of "Game Master", not unlike those that are the bosses/referees in tabletop role playing games like Dungeons and Dragons and its ilk). We engage and progress the story whenever we come across one or more members (the Game Master must be present regardless of whether her/his character is currently in use) when the story-line would make sense. We've been going at this particular story for a week or so now, not counting the break (we're currently on Spring Break).
Past role plays include a cross-dressing boy/girl/does-anybody-know-what-gender-this-person-is-really? in the town of Seacett whose parents and entire family were murdered in a political scramble for power. The main character (for this there was really only one) was on a quest to learn magic in order to avenge her family, but the catch was that magic was restricted to all but the noble classes. The irony is that her father was one of the most avid advocates for maintaining this restriction before his death. The fun here was that the main character had a magic amulet that made her look like one of the commoners, and this was how she hid herself, but that it had an emergency "Battle Mode" that would activate and turn her body into a faux magic weapon at the cost of her disguise. To further complicate matters, she was really her supposedly dead brother... And that, even though her pursuers were anxious to find her and eliminate her as soon as possible, they would only increase their efforts and keep her alive if they knew she was him. Eventually, she did find someone she could trust... Someone that was eventually revealed to be a female noble masquerading as a male noble. And each of these personas (the girl, her Battle Mode, her brother, the tutor, and the tutor's innermost thoughts) was played by a different person.
Now I know I went off topic there, but the question was so simple and the topic such a passion of mine that I found myself going too far. My point is, though I don't role play at lunch, I pride myself on being part of such complicated plots that we literally couldn't fit them into twenty minutes here and there, even if the time was guaranteed daily... And that you can role play about anything!