Aliens. Me and my brother sneakily was watching it when our parents were gone, and when that chest-burster came out of that woman, I was out of there like a bat out of hell. Never told my parents, of course - had to protect our VHS privileges and all that… It’s still one of my favorite movies - the original cinematic cut, not the overly long director’s cut (which seems to be the only one you can find these days.]