Ive got this buddy of mine who swears that not only are there aliens, but that the gov't. is involved in a massive conspiracy to cover up their existence. He has dozens of books and videos on the subject, and typically my eyes just glaze over when he goes on one of his rants. But honestly, some of the evidence is quite compelling. Check this out:
FOXNews.com - Dead Airman's Affidavit: Roswell Aliens Were Real - Science News | Current Articles