This is bugging me. I heard a really good joke the other day, but now I can only recall the punchline. It's to do with some guys (aliens?) in a car park, and ends up with one of them exclaiming 'There's a space, man!'
the only one similar that i remember from school was along the lines of: what would an alien do with a spaceman? park in it man! (kinda said in a dopey almost drug induced way!)