Who's Kilroy?
Golly...I wish I could write it...it's a straight line (fence) and all you see is a hand on either side of a bald head, and of the head, all you can see are the eyes, and the nose hanging over the fence.
The sign below says, "Kilroy was here."
If memory serves me correctly, it was a WWII joke...someone named Kilroy was always "there" first.