According to the Guinness Book of World Records, the human with the most bizarre diet was the Frenchman Michel Lotito (1950 - 2007) from the city of Grenoble.
Mr. Lotito's Wikipedia page says that he began eating glass, metal and rubber from about the age of nine. When he was 16 he began performing publicly, entertaining crowds with his eating antics.
Throughout his career he ate 18 bicycles, 15 shopping carts, 7 televisions, 6 chandeliers, 2 beds, a pair of skis, a Cesna 150 airplane and a computer.
He is also the only known human to have swallowed an entire coffin, including the handles. Though the Guinness book doesn't elaborate on this point, one can only assume the casket was empty at the time of consumption.
It's generally understood that Mr. Lotito was able to ingest metals and other objects normally considered poisonous thanks to a doubly thick stomach and intestinal lining.
Ironically, soft foods like bananas were difficult for him to eat.
You can follow this link here to watch a 5-minute YouTube video of 'Mr. Eat Everything' in action.
And as you watch, keep in mind that oft-quoted cliché - don't try this at home.