As long as we’re talking about freeway overpass grafitti, there’s a famous one still barely visible over the Washington, D.C. beltway. As you go counterclockwise (west at that point), there’s a hill at the Georgia Avenue exit. As you come up the hill (it helps to be in the second or third of the four lanes), the Washington Mormon Temple rises up into view. It’s about a mile away at that point. The reaction of many people to this sight is “This looks just like the scene in The Wizard of Oz where the characters first see the city of Oz.” Between Georgia Avenue and Connecticut Avenue (where the temple is located), there are three overpasses. Sometime in the late '70’s someone painted the words “Surrender Dorothy” on the middle overpass. It was painted over, but in the early '80’s someone painted it there again. It was again painted over, but you can still make out the letters.
On the road to Chincoteague Island, VA, there is (or was) a rather gruesomely designed billboard paid for by some fundie group with the message: “Two choices: Heaven or Hell.” Right above those words, someone spraypainted “Today’s Special:”
Also, I dunno if this qualifies as graffiti, but www.billboardliberation.com has some great stuff.
Someone had spraypainted this message on the wall of an underpass in downtown Los Angeles:
JESUS SAVES FROM HELL
Some wag appended this to it:
JESUS SAVES FROM HELLO DOLLY REVIVALS
In the late 60s I wrote in the grouting in a restroom of El Camino College, Torrance, CA (and I’m there right now, keying this in–in the college library, that is)
PEOPLE WHO WRITE BETWEEN THE TILES HAVE NARROW MINDS
Within a week this reply was added on the next grouting down:
PEOPLE WHO WRITE BETWEEN THE TILES HAVE NO MINDS AT ALL
“If you drive an automobile, please drive carefully–because I walk in my sleep.”–Victor Borge
In a women’s restroom:
Men are only good for two things: one of them is killing cockroaches.
(and below in a different hand) The other is moving furniture.
UCLA also has a grout-joke wall, or did when I was there about a hundred years ago.
I recall seeing the earnest message “Save Soviet Jewry” immediately followed by “Win Valuable Prizes.”
Catrandom
Wendell Wagner beat me to the famous “Surrender Dorothy” story, so I’ll have to go with my second best.
Near Tysons Corner, Virginia, there is a subdivison with its name, McLean Hamlet, spelled out in individual letters at the community entrance. One day I drove by, and some kids had removed a few letters, converting it to Lean Ham.
When I was a kid, there was a local pizza parlor with one of those movie-marquee things that you put on the ground. It originally had the somewhat uninspiring phrase “We serve good food” on it.
Local kids re-arranged to letters to read “We serve dog food”. When I first saw it I laughed til I practically bled from the ears (OK, I was ten years old).
You know, that was 20 years ago, and I still laugh thinking about it.
still on the subjet of bathroom graffiti.
if you are looking for a good joke, look at what’s in your hand.
&
here I sit broken harted, tried to shit, but only farted.
I don’t know if this counts but from the movie “Five Corners” by John Patrick Shanley:
two kids attack a SHOPMERIT sign with small explosives until nearly all letters are gone and it reads SH________IT. They then stand there, complaining about how stupid it looks 
One of my favorites:
When Burger King or Mcdonalds is hiring around here, they often put
“Now Hiring Closers” on thier sign our front. One of my favoriete drunken bitch things to do in the past was to simply remove the “C” in closers.
Memories…
Zette
Love is like popsicles…you get too much you get to high.
Not enough and you’re gonna die…
Click here for some GOOD news for a change Zettecity
Rice university also has a grout-wall.
One of the neighborhoods near my house is “Tall Pines”. The sign used to be individual wooden letters on a wooden background. People would change it to “Tall Penis”.
Not really graffiti, but I think it qualifies in some strange way:
This was at the first rest area on southbound I-81 after passing by Staunton, VA. (Don’t know if the signs are still there, though). Anyway, in the men’s room, above the toilets, there are actual SIGNS saying:
“Water in toilets is for flushing only,”
and it’s accompanied by a little drawing of a drinking cup full of water, with a slash through it.
Are people so stupid that they have to be told this?
In a word, yes.
There is a development in my home town called “Allen Landing.” The sign is always altered to say “Alien Landing.”
‘Flush twice, it’s a long way to the cafeteria.’
‘They couldn’t hit an Elephant from this dist…!’
Last words of General John Sedgwick
The full saying is: “I’d rather have a free bottle in front of me than a pre-frontal lobotomy.”
A TN fave:
*Here I sit all broken-hearted.
Came to shit, now I’m departed.
–Elvis *
Also, over the toilet paper:
University of Alabama diplomas
There was a billboard put up by the group “Jesus Is Lord” here in town. It read:
JESUS IS LORD
of Knoxville
Now, that was plenty funny enough. But some pals of mine weren’t content. They changed the “LORD” into “BORED.” Stayed that way for several weeks.
In Pittsburgh, PA the 6th street bridge had some writing on the walkway. It said things such as “the second coming of Bob Dole is near” and “Long live Bob Dole!” “Vote Bob and viagara for all!”
twisted stuff!
i am special. i am cool. i am doper 3000!
I got this from one of my older brothers girly magazines. ( Hey, I was 12 and I tried to understand the articles.) It just may be the only poetry I know from start to finish.
Here I sit reading
this shit house art
When suddenly I let loose
a terrible fart
It shook the windows
and rattled the walls
and burned the hair
off my dang burn balls.
(I thought that was so funny then…and I wasn’t really sure exactly what balls were.)
Back when Chris Webber was a Washington Wizard, I saw this written in the dust of a truck:
Webber
Is a
Zany
Arrest
Resisting
Dope
Smoker
For someone the sign welcoming people to California from Nevada on the 91(?) is a target for graffiti. Among some of the better ones I have seen on it
Welcome to California
-where we treat you like a King (during the Rodney King Trials)
-Try the double double (in and Out burger reference)
and my personal favorite
-soon to be Disneyland…the state