The focus of this old black and white film, most likely shot through an Earth-based telescope, is on the rear-end of a comet, you can discern flickering gas-clouds or flames, then to the center right in the frame suddenly the letters P.O.O.P appear and disappear twice!
Now, in the Russian alphabet, that reads as ROOR...and has no apparent meaning. But in English it's "poop". Typically a word that would be used by the prank-loving Polkans.
Under any circumstances, it is one of the most compelling proofs of (somewhat) intelligent Alien life I have ever seen.
