Shooting with guns, falls, things fall on top of people and crush them, fistfights and punches, a man is impaled with some blood on his chest, a man is made smaller and then squashed.
Many Martian heads explode into green goo.
The Martians are gross-looking and twice we see Martian autopsies. A woman is left holding a bloody hand when her boyfriend is vaporized, animals are burned and vaporized, body parts are floating in jars and Martians play with body parts. A dog's head is grafted onto a woman's body, the woman's disembodied head screams and is later seen on the dog's body. Two disembodied heads roll around, people fly through the air while the Martians shoot and attack. Maybe ETs won't come in peace, so we better be ready.