These have been around FOREVER... But I amuse easily. I still find these funny and still occasionally try them just for a quick, cheap giggle.

I don't know how you'd go about trying these on a Windows PC, but if you're on a Mac, just open up Terminal (from your Applications/Utilities folder) and you can play along.

Note that the '%' prompt indicates the C shell, while the '$' prompt indicates the Bourne shell. Mac defaults to Bash ($) so to get the % prompt, just type: tcsh

Oh, and please feel free to append your own to this list.

Code:
  $ ar x God
  ar: God does not exist
  
  $ cat "door: paws too slippery"
  cat: cannot open door: paws too slippery
  
  $ cat "food in tin cans"
  cat: cannot open food in tin cans
  
  $ lost
  lost: not found
  
  $ make love
  Make:  Don't know how to make love.  Stop.
  
  $ make war
  Make:  Don't know how to make war.  Stop.
  
  $ rm God
  rm: God nonexistent
  
  % gotta light?
  No match.
  
  % mkdir yellow_pages; cat > yellow_pages
  yellow_pages: Is a directory
  
  % !1984
  1984: Event not found.                  # (on some systems)
  
  % rm meese-ethics
  rm: meese-ethics nonexistent
  
  % ar m God
  ar: God does not exist
  
  % "How would you rate George Bush's incompetence?
  Unmatched ".
  
  % [Where is Jimmy Hoffa?
  Missing ].
  
  % ^How did the sex change^ operation go?
  Modifier failed.
  
  % If I had a ( for every $ Congress spent, what would I have?
  Too many ('s.
  
  % sleep with me
  bad character
  
  % got a light?
  No match.
  
  % man: why did you get a divorce?
  man:: Too many arguments.
  
  % ^What is saccharine?
  Bad substitute.
  
  % %blow
  %blow: No such job.
  
  % \(-
  (-: Command not found.
  
  % sh
  
  $ PATH=pretending! /usr/ucb/which sense
  no sense in pretending!
  
  $ drink <bottle; opener
  bottle: cannot open
  opener: not found
  
  $ mkdir matter; cat >matter
  matter: cannot create
  What ->
  
  
  >%touch me
  >%chmod 000 me
  >%touch me
  >touch: cannot touch me: permission denied
  
  Slightly enhanced version:
  
  % cd /tmp
  % touch this; chmod 000 this
  % ln -s /usr/bin/touch U
  % U this
  U: cannot touch this: no write permission
  
  $ ar x "my love life"
  ar: my love life does not exist
  
  $ ar x "matey, the treasure"
  ar: matey, the tresure does not exist
  
  
  $ talk Gorvachev@Kremlin
  talk: Kremlin: Can't figure out network address.
  
  $ talk Comrade Khruchev
  [Your party is not logged on]
  
  make "bottle open"
  make "heads or tails of all this"
  make love
  make mistake
  make sense
  
  man woman
  man -kisses dog