Almost panicked thinking it was a busted water pipe (but confused because to my knowledge there is no pipe in those walls), but it turns out I hadn’t fully sealed a crushed water bottle and that was what was making the noise.
So almost not a dull start to today. But dull after all. 😅
There’s a particular bottle design that makes the weirdest noises - Minute Maid juice with the 3-4 in wide lids. It can happen from squeezing the bottle and shutting it, or if you take it out of the fridge and it slowly warms up. Strange noises… it can sound like a steady hiss or a strangely rhythmic one.