I don’t believe in pseudo-science, I’m a Skeptic. UFOs, the Flying Spaghetti Monsters, the Loch Ness lake monster, are all bullshit. I repeat: BULLSHIT. However, if there was indeed intelligent life out there wishing to conquer earth and ravage us, I believe that they scanned our planet and found the following music videos before they decided that this planet is definitely not worth it!
http://www.youtube.com/watch?v=Q9ocLN4Dc3I
http://www.youtube.com/watch?v=VfuPuLcAmL8
http://www.youtube.com/watch?v=_qP9OfzdA6s
http://www.youtube.com/watch?v=buXJlBd3Mf8
http://www.youtube.com/watch?v=aFd5Cci_pE4
http://www.youtube.com/watch?v=P86fPsC_cCQ
http://www.youtube.com/watch?v=tsoH7HI8YII
http://www.youtube.com/watch?v=cvgUdrzGNys
http://www.youtube.com/watch?v=u3ltZmI5LQw
http://www.youtube.com/watch?v=4W_kWxWn-Zo
Random Misanthrope 
Tears don’t lie? Now that’s just the voice of inexperience.
Oh, come now… I really don’t think you’re giving Aqua enough credit. I mean just listen to the lyrics of Barbie Girl:
I’m a Barbie Girl, in a Barbie World.
Life in plastic. It’s fantastic.
You can brush my hair.
Undress me anywhere.
Imagination.
Life is your creation.
It’s obvious they’re commenting on the materialism and artificiality of life in the modern world. Nothing is real, as John Lennon often said. Life in the 21st century comes pre-wrapped in plastic. I think that extraterrestrials would be sufficiently impressed by that to consider invading us.