If you believe in aliens such as big eyed gray skinny-ass mouthless walking creatures I'd say you need to get a life and stop watching sci-fi movies. If you believe in aliens such as insects on other planets, bacterias and that kind of stuff, I might understand you because I really doubt that we are the only life form in this entirely galaxy. At least that's me speaking here
Eh, my thought is that he just wanted more fire to the thing....He would of said it long ago if it was real common who wouldn't ?