I have never (fortunately) seen any little green (or grey) men but I have definately seen UFOs!
It was almost two years ago now on a perfectly clear night. The ISS had passed overhead from west to east about half an hour previously and I had just finished setting up my six inch telescope when I noticed a bright pure orange 'star' moving quickly from east to west to the north of my location. I thought at first it was a meteor burning up in the upper atmosphere and was feeling quite privaledged to have witnessed it when about thirty seconds later a second one followed the first and then at about minute intervals a regular group which numbered I think, eight or nine. Whether there were any before I noticed the first I don't know, I managed to grab my big binoculars and tried to view the last few but just couldn't focus on them (even though the surrounding stars came into sharp focus). They appeared just like viewing a large guy fawkes bonfire from many miles away, I did consider those ruddy Chinese lanterns but these were moving at a very fast and constant speed at an extreme altitude with regular spacings between them. (I did later have the chance to view the lanterns through the same binos and they came into sharp focus, were obviously lanterns and moved haphazardly in the wind).
I did report the sighting to a national UFO reporting site and a few days after found there was another person about a mile away from me who had also viewed them passing over and confirmed my observations word for word!
I've never seen them again but I must admit after I close down my attic workshop for the night I always have a quick peep out the skylight!

There are too many trillions of planets out there for us to be unique, just pray they're friendly or else highly prone to MS viruses!!

Robin