Every single UFO sighting before has been a "REAL UFO SIGHTING OMG."
EDIT:
I think that there is the potential for life on other planets, you'd be stupid not to see that. I only say the potential because, we as humans, have no evidence to believe otherwise.
In the Milky Way alone (1 of an infinate number of galaxies), there are approx. 200-300 billion stars. In our solar system alone, there are 9 planets orbiting a star. Of those 9 planets, 1 of them meets the requirements to build and sustain life.
The chances of coming accross another planet with life on it is incrediably high. We've already from places that can maintain human life.
