 Why does the narrator say that the aliens' jokes are dangerous?
Illustrated by Schoenherr The wind howled out of the northwest, blind with snow and barbed with ice crystals. Walking, talking natives on a blue sky planet with 1.1 g gravity and a twenty per cent oxygen atmosphere at fifteen p.s.i. People who talk English, drink beer, like jokes and beat me at chess or table-tennis are people for my money, even if they look like tigers in trousers. It was more that we all seemed to make silly mistakes when we played them and that's fatal in chess. Of course it's a screwy situation, playing chess with something that grows its own fur coat, has yellow eyes an inch and a half long and long white whiskers.
 The wrong kind of joke could end in catastrophe
 The wrong kind of joke could end in catastrophe  It hurts the scientists' reputations to be beat at games like chess  Their practical jokes tend to meddle with spaceship parts  They like to play with weapons and people tend to die