I listen to stuff with a lot of bass, back when the stereo was near his tank (tiny apartment problems) I'd feel his tank to see if I can feel the bass. I have turned it up too high a few times and he came out during the day looking miserable, poor little guy, of course when he did that we turned it down. It's amazing how you can tell facial features even though it doesn't even look like snakes can move they're brow or anything like that. The sunk in tired looking eyes said enough though. lol