There are certainly aliens, there are certainly aliens that have visited earth, there are certainly aliens watching the earth right now.
Now that you've read that is your first though "he's full of it", "Crazy", "delusional" or is it "really?". I have no proof to back any claims other than my memory for myself. I've seen them, twice. And none of this assures anyone of anything, and neither will anything anyone else has to say.
All evidence will be discredited and you will not know for certain (if you don't already) know that aliens exist in your, your childrens or their childrens lifetime. Humans just aren't ready, our ego's are still too large, we can't accept there is something better, we won't accept it. And it's a shame....
Keep in mind I might have been delusional both times, I have no history of mental illness though and have never seen anything else out of the ordinary. I might have seen a ghost once, but I think that was probably something else, nothing paranormal.
Replace the word aliens with Jesus and people would tell you to stop talking to your imaginary friend in the sky. Neowin!