Science said it could not be, but there it was. And whoosh—look out—here it is again!...

Spaceship crews should be selected on the basis of their non-irritating qualities as individuals. No chronic complainers, no hypochondriacs, no bugs on cleanliness—particularly no one-man parties. I speak from bitter experience. Because on the first expedition to Mars, Hugh Allenby damned near drove us nuts with his puns. We finally got so we just ignored them. But no one can ignore that classic last one—it's written right into the annals of astronomy, and it's there to stay. Allenby, in command