Fredric Brown's "Knock" (short story, alien invasion, free)

Going by the comments online, it appears to be among the better known stories of Brown. Not a very believable conclusion, but light fun read.

Story summary.

Aliens called "Zan" have raided earth. They took a few hundred animal specimen alive - among them a man & a woman, & killed off all other life on earth. These specimen, including the humans, have now been put as exhibits in a zoo on earth, & this advanced raiding party of aliens is preparing to claim earth as permanent residence.

The man will pull off a coup of sorts, scaring aliens enough with his
ingenuity to make them leave earth...

Collected in.

1. Everett F Bleiler & T E Dikty (eds)' "The Best Science Fiction Stories: 1949".

Fact sheet.

First published: Thrilling Wonder Stories, December 1948.
Download full text.
Download audio of X Minus One radio adaptation of this story from Internet Archive. (alt MP3 link)
Rating: A.
Related: Stories of Fredric Brown.