I ordered a DVD from amazon.com just this past week that I'm anxiously awaiting. It's called "Fire in the sky". It's a movie about Travis Walton, who claimed alien abduction and relates eyewitness testimony.
Here's a link to his website:
http://www.travis-walton.com/
Now, as to whether this particular instance is fact as opposed to fiction, I can't say......but like many others here....I can't look at ALL the many stars, solar systems, galaxies, etc....and think that WE'RE the ONLY ones
populating a planet. What a literal waste of space otherwise.
I also think all the governments of the world are aware....but to acknowledge it without having a plan of protection (for an unknown entity or several....each of different species along with strengths and weaknesses we're unable to understand) would be futile. We would be the same way with our own children.....why stir up a ruckus when you have no plan to deal with it? So your only choice at that point is to lay low til you're forced to do something about it. If whatever alien life MADE it to our world....they're already obviously way above our abilities.