You have probably heard the Wilhelm Scream before.
Unless, of course, you're deaf...
or you suck.
Anyway, this stock sound effect was made famous primarily by the Star Wars and Indiana Jones series. It's been featured in over 100 films and TV shows (not to mention a handful of video games).
If anything, it has to be one of the most famous sound effects, alongside Tarzan's yell (which I will probably make some kind of pack for as well :P).
Surprisingly, the Wilhelm Scream compliments the gameplay nicely, especially if you aren't some hardass who takes their death sounds too seriously. The background noises in the sound files are completely unnoticeable during gameplay, I find.
You will like this if you are a long time fan of the Star Wars trilogy like myself, or maybe you won't, whatever.
I also added in 3 head shot sounds incorporating the Wilhelm Scream. They are brutal.