Acquittals in espionage cases are virtually unheard-of.

Source: https://www.nytimes.com/2023/03/30/briefing/donald-trump-evan-gershkovich-guo-wengui.html

Giant stretches of the world’s oceans are experiencing unheard-of hot temperatures, alarming oceanographers, coral researchers and atmospheric scientists the world over.

Source: https://globalnews.ca/news/9925937/accelerated-global-warming-el-nino/

Such an unheard-of exercise of temporarily living within its means would have broken the deadly shibboleth that every dime of Uncle Sam’s bills must be paid once incurred.

Source: https://www.lewrockwell.com/2023/01/david-stockman/if-mccarthys-concessions-enable-the-next-debt-crisis-bring-it-on/

The story got an unheard-of 1.5 million hits from amid Singapore’s 5 million-odd population virtually from the moment it was uploaded, and far more than Nikkei had ever scored on a Singapore story, by a factor of thousands.

Source: https://www.asiasentinel.com/p/singapore-kills-chicken-scare-monkeys

We can see this quite simply in the size of the fund's discount, which is generally an unheard-of discount apart from energy infrastructure funds.

Source: https://seekingalpha.com/article/4638770-aod-this-dividend-income-fund-is-lot-better-market-thinks?source=feed_all_articles

When Morty stupidly agrees to all the legal terms of a new app and legally signs his life away to a faceless and unheard-of company, they immediately seize control of him and his life for their own purposes, in Rick and Morty: Corporate Assets.

Source: https://bleedingcool.com/comics/rick-morty-lights-quinnelope-in-oni-press-september-2023-solicits/