“What do you do when you see a spaceman?”/“You park, man.”

A parking joke is:
 
Q: What do you do when you see a space man?
A: You park in it, man.
 
The joke has been cited in print since at least 1993.
 
     
Google Groups: alt.tasteless.jokes
Joke made me laugh when I was pissed
Fisher
4/24/93
What do you do if you see a space man?
 
Park in it man.
 
Google Books
The Solicitors’ Journal
Volume 137
1993
Pg. 58:
Q. What do you when you see a spaceman?
A. You park, man.
 
27 March 1994, The Sunday Age (Melbourne, Australia), “HA HA HA,” pg. P5, col. 2:
Lano & Woodley
WHAT do you do if you see a spaceman?
You park in it, man!
 
Google Groups: alt.humor.puns
Puns of the Weak 5/11/01
Stan Kegel
5/12/01
(...)
What do you do if you see a spaceman? Park your car in it, man!  (Syman Hirsch)
   
Straight Dope Message Board
The Dumbest Joke in the World, and I can’t stop laughing
Tomcat
04-05-2002, 11:33 AM
(...)
Q: What do you do when you see a spaceman?
A: You park, man… (said in California surfer-dude voice)
 
Twitter
Jillagain
‏@Jillagain
@Mookalicious What do you do when you see a Spaceman?... You park man!
1:57 PM - 20 Aug 2009
 
Twitter
Daniel
‏@techdad_xyz
What do you do when you see a spaceman? You park, man.
1:18 AM - 21 Aug 2009
 
Google Books
The Mammoth Book of Really Silly Jokes
By Geoff Tibballs
London: Constable & Robinson, Ltd
2011
Pg. 435:
What do you do if you see a spaceman?
Park your car in it, man.
 
BuzzFeed
67 Jokes That Will Make You Go “Ba Dum Tss”
Three men walk into a bar… Ouch!
posted on Apr. 18, 2014, at 3:45 p.m.
Tanner Greenring
(...)
63. What do you do when you see a spaceman? You park, man.
 
Google Books
A Prairie Home Companion
Pretty Good Joke Book (6th edition)
Introduced by Garrison Keillor
Prince Frederick, MD: HighBridge, a division of Recorded Books
2015
Pg. ?:
What do you do when you see a space man?
You park in it, man.