In the sitcom The Big Bang Theory, in Season 1 Episode 9, Leonard Hofstadter cited this joke with slight variation (as "spherical chickens in a vacuum").
Baby Cow Productions | cow | Poor Cow | Top Cow Productions | Clarabelle Cow | Spherical Earth | Spherical coordinate system | spherical aberration | ''Leucanthemum vulgare'' and a cow in Kyyjärvi | Cow-Cow Boogie | Cow | Where's My Cow? | Vechur cow | Two Cow Garage | Steller's Sea Cow | Sacred Cow (Bob's Burgers) | Red Cow interchange | Plancherel theorem for spherical functions | Molly Moo-Cow | Half A Cow | Elsie the Cow | Cult of the Dead Cow | Cow wheat (''Melampyrum pratense'') | cow's | Cow hitch | cow head protests | Cow dung | Cow Creek, Kentucky | Cow Creek, Florida | Cow Creek Band of Umpqua Tribe of Indians |