UFO's and extra-terrestrial life

[Rattlehead]

I've always found this an interesting topic, and usually pretty much everyone seems to have an opinion on whether UFO's and extra-terrestrials exist or not.

Do UFO's exist? Did something alien really crash at Roswell? Did something strange really land at Rendelsham Forest? (Sp?) Have aliens colonised this planet before? Have they visited? Are abductions real? Did the US government reverse-engineer alien technology and incorporate it into experimental airctraft?

Or are aliens and extra-terrestrial life forms nothing more than our modern-day fairies and goblins? Figments of wild imaginations and paranoia?

Discusions please.