There's a fellow over in the Planetary Imaging forum fighting for his life in the comments, after claiming that he resolved Uranus' five major moons (including Miranda, smaller disk than Betelgeuse) into spheres with his 155mm refractor (complete with the usual ad hominem attacks and dismissing people's arguments with his chem degree).
These things never cease to make me chuckle, so I'm curious. What's the dumbest, most ludicrous thing you've ever heard a fellow astronomer claim to see?