I was sitting here, playing on the webb when saber was sitting on my bed cleaning himself up, just because that's what he does when I here this sound, kinda like air being let out of a balloon that's too tight. I wasn't sure i really heard it, o I went back to my computer. A few seconds later I heard it again, slightly louder, and wondered where it was coming from. Several seconds later, again, and slightly louder with a little squeak added to it this time.
I quickly tracked down the source of the sound- Saber, apparently with a good deal of gas, and making more sound than any small creature should in that way.
Good thing I have been burning a scented candle all day and into tonight.