Journal of the Identical Lunch

Journal of the Identical Lunch, published in 1971, records the experiences of artist Alison Knowles and her friends all eating an identical lunch — "a tunafish sandwich on wheat toast with lettuce and butter, no mayo and a large glass of buttermilk or a cup of soup" — though not all at the same time. Knowles herself reportedly ate this identical lunch every day at a New York diner.

Copies of the book are now quite rare, so if you want one (perhaps as an investment? The price will surely only go up) it'll cost you at least $200, and perhaps as much as $500.

More info: artnet.com, MoMA.org