From the story archive · Fictional encounter
Taking a zero-gravity plane flight (the "vomit comet") that creates 30 seconds of weightlessness. Floating in midair with 20 other passengers when—PRRRT—a barking spider joins us in microgravity.
The NASA consultant on board immediately announces: "Ladies and gentlemen, you've just witnessed the rarely observed phenomenon of a free-floating gas pocket in zero-G conditions." The scientific explanation made it much funnier.