h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

The simplest way is to let someone buy you lunch and try to persuade you about something you already agree with, or you could walk into a friends apartment and steal food as in every good american sitcom, or you could learn to be a jedi and perform mind tricks, or use leprauchan gold, although these last two only work on Tuesdays for some reason, another graet way to get a free lunch is by living on air but you run the serious risk of looking like a w****r, basically despite what certain people think it is quite easy to get a free lunch. I personally have been on training courses where not only do you get a free lunch but they pay expenses andd let you out early enough to go shopping. Everyone at some point will get a free lunch.

As an alternative, you could always try rooting around in dustbins

or you could try writing to the president