To clarify, it's not a cracker from the movie, it's one from the actual Titanic, making it 103 years old. Yummers. 

The "last surviving cracker" from the ship, which sunk in the north Atlantic over a hundred years ago in 1912.

A biscuit that survived the sinking of the #Titanic has sold for £15,000 at auction, worlds most expensive biscuit. pic.twitter.com/GMVDcXTDtr

Overlooking how shocking the exchange rate is at the minute, Mashable states that: "The cracker was reportedly part of the survival kit from a Titanic lifeboat and was kept by James Fenwick, who was a passenger aboard the SS Carpathia, which helped survivors of the Titanic more than 100 years ago."

According to auctioneer Andrew Aldridge: "It is incredible that this biscuit has survived such a dramatic event - the sinking of the world's largest ocean liner - costing 1,500 lives."

As for who forked over 21 grand for a cracker, it was a Greek collector.