Please understand that I am not asking what are the things that make us scream. I mean... why scream? Why would this particular reaction evolve to be our response to things which are frightening? It's almost as if evolution has kindly gifted us with a response that says, "Oh, by the way scary lion/tiger/bear/monster. Just in case you didn't notice me and you might be hungry, here is an extremely easy to follow audio indicator as to my exact location for your nomming pleasure. And by the time you get to me I promise to be succulently basted in my own urine." If I were designing a creature for a fantasy or science fiction world, these particular responses are not what I would choose in the design of my creatures. They don't seem very intuitive. So, why would evolution do this?