TLDR: Farmer agrees to sell some flax in the future at a fixed price, by responding “👍” to “please confirm flax contract”. Later, as the market price of flax went up, the farmer demands more money. They buyer then goes to court to force the farmer to sell the flax at the agreed price, judge rules that the “👍” does count as agreement.
This is a contract that was made several times previously, with similar informal agreements like “ok”, but this time the farmer tried to get out.