Most Helpful Guy
I voted Xenomorph, but on 2nd thought a Predator. Sure a Predator might rip your spine out or he might just stab you in the heart and that's it.
A Xenomorph? Well you better hope it's not a face hugger or you're fucked. That's a fucked up way to die... you know having a alien being born inside you and ripped out of your chest.