Have you ever written your name on a water tower?

I was about 15 years old and i guess i must have invented the first graffetti. i climbed my neighborhood water tower and painted my initials on its side for the world to see. to my amazement, you can still see my initials painted there, after all these years. i also carved my initials in an old oak tree back then. its still there(barely), along with my then girlfriends initials. am i the only person that has made these adventures a part of my personal history or am i not alone in this endeavor? what about you? what did you do in your past that still lingers in your memory today?