ALIENS: Do you believe their existence?

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I haven't seen any single alien in my entire life. I am not sure if any of you here have seen any of them too. Videos, pictures, and testimonies which came from real people suggests that there really is life outside the planet that we live in. How about you? DO you believe their existence? If yes, what if they would come and invade the earth, make people their slaves, ..what would you do?