If you suddenly came upon a dead body out in the woods or in an alley, what would you do? I'd probably say, "Day-um! Look at that! Better call the cops!"
Would you let out an intense, guttural scream? Hmmmmmm, probably not. Well, you might if you were a defenseless woman, at least that what all the TV shows would have you believe. Have you ever noticed on these TV dramas like CSI that the discovery of a body is often followed by one of those screams, followed by an advertisement?
I can only think of a few circumstances where a scream might be useful, like when being chased by a grizzly bear? On the other hand it might be better to exert energy running, or climbing a tree rather than screaming.
Perhaps falling off the Empire State building would warrant a scream. On the other hand, in a few seconds you're gonna be dead, scream or not, so I just don't know.
Oh well, I guess it's just television's attempt to create dramatic effect, like when people ride an ambulance to the hospital for a mosquito bite. Yeah, that's gotta be it.