Jeppson's Malört
en.wikipedia.org
en.wikipedia.org
I don't drink much but usually have a bottle of Malört in the kitchen for special occasions. It lasts forever because nobody wants to drink a lot of it, and always creates a lot of entertainment at parties.
For some weird reason this stuff is incredibly common at Defcon.
https://www.saveur.com/ridiculously-bitter-chinese-tea-that-...
The way it was pitched to me was "this is so bad that during prohibition they let people still sell this because it tasted so bad".
I quite like Malört. If you are into other bitter liqueurs, like Fernet or Absinthe, then definitely give it a try.
I love amaros and bitter liqueurs, but malort is a hard pass.