Ian dury used something like this in "what a waste". . . It's the gurgling noise made when the last of the water runs down a bathroom sink plughole. Conveys almost as much meaning as a cistern flushing, but in a shorter time (smaller file size). As ever (with my stuff) no "noises off" and so ready for mixing!.
Lift, 1960s 2, poland, outside, inner cage and door open, person steps out, floor sinks. Stereo mixdown of an ms recording, using sennheiser 416 (m) and some small diaphragm figure of 8 akg.