In the before computers times there was an ironically titled book called 'Steal This Book'.
Amongst a verity of other things it describes one of the funniest and most beautiful hacks I've ever heard of. I'm leaving this as a hint for others for fun or the rare cases that I know are on here that absolutely need to eat without money.
It requires one trusted accomplice and an all you can eat buffet. The rest is up to you to find out. It always works flawlessly and has for over half a century.