 What didn't surprise Casey about Jupiter?
JUPITER'S JOKE By A. L. HALEY Casey Ritter, the guy who never turned down a dare, breathed a prayer to the gods of idiots and spacemen, and headed in toward the great red spot of terrible Jupiter. [Transcriber's Note: This etext was produced from Planet Stories Fall 1954. I never thought I'd mess around any of them, but things can sure happen. It just ain't big enough for a gent of scope and talent; and the day the Solar System Customs caught me red-handed smuggling Kooleen crystals in from Mars, I knew I was in that corner, and sewed up tight. Sure, the crystals are deadly, but I was smuggling them legitimately, in a manner of speaking, for this doctor to experiment with. But—and this was the 'but' that was likely to deprive the System of my activities—even experimenting with them was illegal even if it needed to be done; also, I had promised not to rat on him before taking the job. So there I was, closeted with the ten members of the S.S. Customs Court, getting set to hear the gavel fall and the head man intone the sentence that would take me out of circulation for a long, long time. And instead, blast me, if they didn't foul me with this trip to good old Jupiter. I'd argued with 'em, but inside I'd been all set for the sentence, and even sort of reconciled to it. Then I croaked, "Jupiter! Jupiter was worse than the pen, a lot worse. Jupiter was a death sentence. "You've no doubt heard tales of the strange population of Jupiter," he said. How could any—" The senior judge rapped ferociously, and I skidded to a halt. We possess well-authenticated photographs of these inhabitants, and if you are prepared to visit them and in some way worm from them the secret of their anti-gravity field, the government stands ready to issue you a full pardon as well as a substantial monetary reward.
 the aliens communicated by tapping
 the red coloring was plants  items could float in mid-air  the aliens could remove their eyeballs  the aliens communicated by tapping