I think a lot of it is fake and/or people are just crazy. I don't definitely believe in the whole thing but I can't say for sure that aliens don't exist.
An old friend once told me a story of her mom seeing one but she was very private about it because it had really freaked her out. Some flying machine with bright lights kind of hovered low and followed her car for 20 minutes or something like that and then just took off straight up.
I do believe that story because my friend and mom are trustworthy people. But there could be some other explanation for what she saw I suppose.
I think it is all a load of rubbish or those crazy American military keeping their new inventions under wraps but testing them out on the poor public! lol If that makes sense?!?!