https://english.elpais.com/usa/2021-05-12/four-mathematicians-demonstrate-it-is-impossible-to-predict-where-rubber-ducks-in-the-sea-will-wash-up.html

After a multi-year investigation, four Spanish mathematicians have determined that the traversal of large numbers of items scattered into the sea from container ships during storms cannot be accurately predicted with a mathematical model.

For the most part, they have the look of NP types.