I’ve worked in trading for some time now (on the tech nerd side) and can still remember my jaw dropping when I learned that FCOJ is actually traded and wasn’t made up for the movie.
Why you can’t trade onions futures is also a fun read, for similar reasons (“The Great Onion Corner”).
https://www.npr.org/2015/10/22/450769853/the-great-onion-cor...
Mostly S&P 500, Pound Sterling and Live Cattle.
And thanks for those links!