Invented by Richard Waters in the late 1960s, the waterphone is an unusual instrument that often contains a bit of water to help create its signature sound. Used in a variety of movies and albums, the instrument is often associated with otherworldly, mysterious, and/or suspenseful moments. From wikipedia:
Boomwhacker Bach: Prélude n°1 aux tubes musicaux.
A waterphone (also ocean harp or AquaSonic waterphone) is a type of inharmonic acoustic percussion instrument consisting of a stainless steel resonator bowl or pan with a cylindrical neck and bronze rods of different lengths and diameters around the rim of the bowl…
Several sizes and design variants of the instrument exist. It is generally played in a seated position by a soloist and either bowed or drummed, played as a friction or struck idiophone, with movements to affect the water inside. This combines the resonant characteristics of the bowl and rods in combination with the movement of the water.