Illegal aliens don't come from space... but we do. Nobody wants to deport anyone who isn't willing to work for less than minimum wage anyway. We were planning on infiltrating the human gene pool and slowly conquering your planet in a half-dozen generations(give or take). Unfortunately Earth girls only have two boobs with one nipple each. We don't understand how any intelligent life form can find that attractive.
"Rock It In The Ozone" - the most self-explanatory music video you will ever see...
The Cosmic Trousers - An Interpretive Film