Holy fucking shit! I was in my truck on my way to work when I heard this really loud hissing in my backseat. It almost literally scared the shit out of me. I slammed on my breaks and eventually got to a stop. I got out of the truck and opened all the doors and looked around but I couldn’t find anything. It must have been some kind of hissing bug. I hate bugs! I’m not afraid of any human being, but the smallest of bugs will freak me right the fuck out!!!