The haunting crying instrument that you’ve heard in thriller / horror movies.
Invented around 1968 by Richard Waters, the waterphone is an atonal musical instrument which has vertical metal rods of different lengths attached to a metal resonator pan/bowl. Inside the resonator is a bit of water, similar to a water drum, so when the vertical rods are played (with a mallet or more frequently with a bow) the resonator can echo and bend the sounds. The effect ranges from spacey to creepy.
Given its haunting sound the waterphone has been used to create tension and uneasiness in a variety of TV shows, theatrical productions, and movies. You can hear it in ALIENS, Poltergeist, Star Trek: The Motion Picture, etc. It’s used for jump scares such as in The Matrix when Neo’s new cellphone rings. It’s been used in multiple productions of A Midsummer Night’s Dream. Mickey Hart of the Grateful Dead has used the waterphone, Tom Waits has used the waterphone, as well as a host of contemporary classical composers.
Waterphones aren’t all scary though. Composer and activist Jim Nollman used the waterphone on Playing Music With Animals, where he played a waterphone to orcas.