Return of Planet Ten

What if a flying saucer landed on the White House lawn today - what would you do? That has been a sci-fi scenario for quite a while. The world falls into madness as the alien overlords begin to systematically eliminate the human population for one bizarre reason or another. It's an idea that sells a lot of books and movie tickets, but it also brings to light something else. Like snakes and spiders, people are inherently afraid of an encounter with life forms not of this Earth. Nowadays, the general population is more open to the idea that we are not alone in this universe. But what does that really mean? And what if aliens were not just a question on a survey? What if they were real? How would the world respond to a true encounter - how would you react?