It is quite crazy. I have experienced this before and once I was on LSD. That was not a nice experience, I heard screaming babies. Easy enough to stop (put on music!) but really creepy. I thought I was going mad for a minute or two.
LSD and cannabis make it really easy to hear things out of ambient or static noises. It's pretty bizarre. But if you're aware of it as it's happening, you can actually control it to an extent and even make yourself hear whatever you want.
Yes, I've also experienced auditory hallucinations with LSD. Also synesthesia. And subsequently, with marijuana as well.