I like the idea that it's actually "a cap from Super Mario brothers".
I believe in the possibility of other intelligent life aside from humans (you can't argue with centuries of proof), but as for flying saucers just randomly feeling the need to fly through the sky for no apparent reason...I don't think humans are really so interesting. Maybe the idea of aliens comes from the need for humans to believe that there is something in this universe greater than oneself. But, of course, that's just my opinion.