"We come in peace to blow up your home."
Jumba Jookeba - Lilo & Stitch: The Series
"If you come in peace, surrender or be destroyed. If you're here to make war, we surrender."
— President Truman, Futurama
Amy: We come in peace!
No need to be alarmed, we come in pieces.
"Okay, time for the peace mission. Let's lock and load! This is for being indigenous!"
The discovery that they were not alone in the universe had brought the people of Earth together in a way that had never been possible before. Nations, tribes, creeds and religions were finally united in a mutual sense of xenophobic terror. Thanks to a constant stream of unimaginative sci-fi movies, everyone was convinced that aliens had nothing better to do than conquer planets and impregnate their women with carnivorous offspring.
— Plan 7 of 9 from Outer Space