Does UFOs and ETs exists?

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On the 9th January 2007, a streaking greenish light across the sky was spotted by many people in Singapore, and they must be wondering WHAT THE HELL IS THAT!!?? Many thought was a meteor, but the METS dept. of NEA (Nat'l Environment Agency) said there is no info on the phenomenon as it was too small to be detected by the satellite. According to some experts, their views had beg to differ. Mr Albert Lim, president of The Astronomical Society of S'pore (TASOS),suggests that it is a meteor but a 100 times brighter. However the Chief Exec of S'pore Science Center, Dr Chew Tuan Chiong, had a different view as he believe it to be a green flash, as this phenomenon occurred around sunset and is probably caused by the scattering of sunlight by the small particles in the atmosphere, thus resulting in different light components. But to a layman like us, we view this scenario as something unusual and in awe. So, does UFOs and ETs exist, as we always see report sightings published in the media? One would probably dismiss it as propaganda, or hallucination, or just plain imaginations on peoples' thoughts. To me, I sort of believe it half-heartedly, as I noticed that UFOs like to visit the Americans and S.Americans frequently. Of course in Asia, Iran has seen more of UFOs sightings than most of the Asian countries, but I would be inclined to believe that whenever the UFOs appear at these continents as stated, there's always SOME BIG EVENTS happening or gonna happen. Theory suggests that they are like the prophets who can foresee or foretell calamities or disasters that are gonna happen and they are there to observe the ongoing event. Some even suggests that they are there to collect we human species as test, in order to know more about us and what best way to do that is other than natural disasters taking place that they can collect us 'officially', instead of just scooting down to Earth and scooping people off their feet just like that? In this way, people will notice them and their mission will be exposed. Whatever it is, I believe that somewhere out there something or some form is watching and observing us from afar.... Any opinions out there?