Also,
I know it's been done a bazillion times, and I know it stopped being funny to most people years ago, but me and a friend are actively planning to stencil "Hammer Time" on some local stop signs one saturday.

In this part of rural scotland, it'll amount to the largest terror attack in a generation.
( baw__bag contains traces of nuts on, Thu 17 Sep 2009, 18:13, 8 replies)

Seen that one; made me grin
Someone did it down the road from where I used to live, along with one reading 'Don't STOP believing' for us older folks.
(louveciennes , Volvospotter, Thu 17 Sep 2009, 22:18, closed)

I keep planning...
to add a sign under those "REDUCE SPEED NOW" signs - "TAKE COKE INSTEAD"
( snee held his breath since, Fri 18 Sep 2009, 9:59, closed)

On the sign welcoming drivers to the town of Ratho Station near Edinburgh
someone has scribbled the legend underneath

"You'll never leave."

Nice touch.
(Reverend Fister "a disciplined fuckwit", Fri 18 Sep 2009, 11:08, closed)

no matter
how many times i see something like that it still makes me giggle.

a few months i saw a stop sign that had "HELP HELP I'M BEING OPPRESSED!" scrawled on it with an arrow pointing to were it said stop
(stitched, Fri 18 Sep 2009, 14:29, closed)

I also like
stop collaborate and listen
(JaNayNay, Fri 18 Sep 2009, 15:05, closed)

I like the roadsigns that say "Hidden Dip!"
It's my ambition to put up another sign, 50 yards down the road from it, that says "Hidden Crisps!"
(bagofpinenuts, Sat 19 Sep 2009, 20:21, closed)

Give way
There's a road sign in Berkhamstead that used to say "Give Way" it now reads "Give Head"...Still makes me chuckle but you have to think of a good excuse for the sudden bout of giggles when your parents are in the car with you.
(ThePick Nevermind the length, feel the thickness, Tue 22 Sep 2009, 17:20, closed)

There was a sign near us
that originally said 'Please drive carefully', comeone had gone to a good amount of time and effort to make a sticker to replace carefully with 'Eratically'.
A good choice of word, and a few steps higher than the usual xxx is gay grafitti
(badgerlikespeed, Wed 23 Sep 2009, 14:47, closed)