Oddly, this sound reminds me of something. MAybe not "reminds", because I have never heard the sound I am about to describe... but "makes me think of" is a better way of putting it.
It makes me think of the sound of a toilet flush cistern filling up with water, recorded and then heavily compressed as an mp3 file at very low bitrate. Maybe someone wants to recreate this sound using the method I suggest :)
Man, I wish this was on Soundcloud so I could comment on the timeline. - But hey, forget I said that. Don't post them there. No, no, no, no... Post here at Freesound so that we can download and further manipulate these beauties!