In the 1950's, Hollywood cranked out a lot of low-cost black and white movies involving strange beings from other planets visiting the Earth. Movies like The Day The Earth Stood Still, War of the Worlds, and others long since forgotten. We seemed to be able to get in free at all of the local theaters (for an occassional plug), so Peter McLane, a super movie fan, and myself ended up watching many of these films multiple times. One day they sparked an idea for a promo we had to try. Honest, we weren't smoking anything in those days.
I'll let you guess how it was achieved and who voiced it.