“Space cowboys imply the existence of space cows”

A “space cowboy” is someone who smokes marijuana (and gets “spaced out”). “Don’t Space Cowboys have -er- Space Cows?” is a joke that was posted on the newsgroup alt.basement.graveyard on June 15, 1999.
   
“Space Cowboys implies Space Cows” was posted on Twitter by Rickey on March 13, 2013. “Space cowboys imply the existence of space cows” was posted on Reddit—Showerthoughts on July 30, 2020.
 
         
Urban Dictionary
space cowboy
(n.) Stoner, pothead, somebody who constantly smokes marijuana.
Yo, that guy is such a space cowboy.
by Zickddot December 07, 2006
 
Google Groups: alt.basement.graveyard
INTERNET GRATIS”
Irv Mullins
6/15/99
Don’t Space Cowboys have -er- Space Cows?
   
Twitter
Josey4628
@josey4628
#draw365 day 25 - you’ve herd of space cowboys (pun intended)? Well that must mean there are space cows
http://bit.ly/8eidkR
7:41 PM · Jan 16, 2010·Twitter Web Client
   
Twitter
Brian Ward
@braindraw
#FavoriteMovieQuotes “We have to transport this herd of space cows. It’s our job.” - Space Cowboys
4:45 PM · Jun 25, 2012·TweetDeck
   
Twitter
Ricky
@erickomans
Space Cowboys implies Space Cows. So I guess your mom did go to a better place.
6:12 AM · Mar 13, 2013·Hootsuite
   
Twitter
Will Greenburg
@WillGreenburg
You can’t have space cowboys if you don’t have space cows
12:38 PM · Apr 15, 2013·Twitter for iPhone
   
Twitter
Strange Tips
@strangetip
Space Tip: Before we can have space cowboys we need space cows. Someone get on that.
11:44 PM · Oct 23, 2014·TweetDeck
   
Twitter
smallmangoes
@pugDNA
Does the existence of space cowboys confirm the existence of space cows?
9:15 PM · Nov 25, 2014·Twitter for Android
   
Twitter
LenAlone
@Lenn_Len
If there are space cowboys, there must also be space cows.
How does one milk those in zero gravity?
12:58 PM · Mar 8, 2016·Twitter for Android
   
Twitter
Dr.Scotty
@Thunmont
It just occurred to me the existence of Space Cowboys implies the existence of Space Cows. Steve Miller was right… I wasn’t ready for that
7:34 AM · Sep 27, 2016·Twitter for iPhone
   
Twitter
A Very Nice Boy
@Laser_Cat
The fact that there are space cowboys implies that there are space cows and that’s why I haven’t slept in 4 days.
5:02 PM · Mar 6, 2018·Twitter for Android
 
Reddit—Showerthoughts
Posted by u/GraciousCinnamonRoll July 30, 2020
Space cowboys imply the existence of space cows.
COMMENTS
Stonewall119
Space cows imply space milks
TheAnagramancer
That milky way had to come from somewhere…