Crow/Raven

Last night, I was really bored, so I decided to smoke. While doing so, it suddenly became completely silent, which was strange since I live in the city, where it's almost never quiet. I didn't think much of it at first, but then around 2 AM, 1 heard a single loud crow or raven cawing. That startled me, and I froze; fear washed over my entire body. I'm not sure if it was the weed or if I went through some sort of spiritual experience. Anyway, I could use some help.