You can do this at home with very warm water and a soft bulb, squeezing it as hard as you can, and it is terrifying. It feels uncomfortable and sounds very loud. Do it for as long as you can stand, and then do it more. Do it for so long that you feel like an idiot and get dizzy.
About 10-15 squirts past the moment when you think there can't possibly be any point to what you're doing, an eldritch horror will come out of your ear into the sink, and you'll hear sounds you haven't heard in years.
Then do the other ear.
