Phys.Org: Black holes sometimes behave like conventional quantum systems.
[1]https://phys.org/news/2019-11-black-holes-conventional-quantum.html

   Jim Bell's comment:



   One big problem is that scientists who work on black holes occasionally
   mysteriously disappear, and a very brief sucking sound is heard in the
   lab room next door.

   <Sshhhhoooooooopppppp!!!>

References

   1. https://phys.org/news/2019-11-black-holes-conventional-quantum.html