 What is the significance of the title, “Jupiter’s Joke?”
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. Those methane and ammonia planets, take it from me, they're the dead-end of creation, and why the Old Man ever thought them up I'll never know. 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. And instead, blast me, if they didn't foul me with this trip to good old 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. 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. That whole Kooleen caper: Had it been just a trap to lead me straight to this? Well, a cross between a scorpion and a grasshopper, to be accurate.
 The joke is that Casey’s court hearing sentences him to flying into Jupiter’s red spot to face the supposedly deadly, scorpion-like people who live there. In actuality, the scorpion people aren’t as dangerous as thought, which could be a good deal for Casey to take.
 The joke is that the scorpion-like inhabitants of Jupiter’s Great Red Spot are actually planning an attack, and that they sent Pard to Casey in order to trick the humans into giving them one of their own.  The joke is that Jupiter’s Great Red Spot is actually made of harmless gas, which means that Casey can fly into it without worrying about protection.  The joke is that Casey Ritter is being tricked by the scorpion like inhabitants of Jupiter’s Great Red Spot, and that they plan to steal Casey’s emeralds and hold him for ransom.  The joke is that Casey’s court hearing sentences him to flying into Jupiter’s red spot to face the supposedly deadly, scorpion-like people who live there. In actuality, the scorpion people aren’t as dangerous as thought, which could be a good deal for Casey to take.