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In the event I should ever claim to be "Abducted by Aliens", please point me to this post. This is a list of things that I'd have to have to believe that there are indeed other intelligences out there:
1) They come in the open, none of this sneaking around crap.
2) I must be taken to their home planet, with said departure witnessed by a roomful of SOBER witnesses, and video be taken of the event - with a web or newscast crew present.
3) I must visit their society, see the equivalent of libraries and museums, and then return home with signicficant evidence of their civilization.
" Significant Evidence " being something much larger in scope and size than a organo-metallic rice grain of indeterminant composition that looks like I lost control of a lathe at some point in my working life.