Well, to be fair, we didn't see the results of that transporter accident...but that "shriek"! BRRRRR!!!!! I don't know how they did it, but something about that sound worked its way to the fear centers of my reptilian "hind brain" to TOTALLY freak me out! Even today as I'm nearing my 50th birthday, I will mute the sound when it reaches that moment in the film. Strange as this may read, I find that "scream" far more unnerving than the chest bursting sequence in "Alien"!
That sound for me warrants an "R" rating!