Seen in a Gents' by my uncle in 1959:
1st graffitist I leap with glee, I jump for joy,
Cos I was here before Kilroy!
2nd graffitist Sorry to spoil your little joke,
I was here, but my pencil broke.
(Signed) Kilroy
3rd graffitist While you are reading this you are piddling on your shoes

And more recently, a couple of headlines in my local newspaper:
Man dies waiting for bus I've been at that bus-stop myself a few times!
Folksinger killed by Transvestite And I think I've been to that folk club!

Steve