I've always liked "Slow Children at Play".

In my area there are a lot of deer-crossing signs, which consist solely of a black silhouette of a leaping buck on a diamond-shaped yellow sign. On several of them, you'll find that kids have put a red bicycle reflector on the nose of the deer.

Recently I saw a disturbing sign in front of a church near my home. It was one of those signs large enough for clever, pithy messages to be posted, and changed every so often. One week, the message had been changed to read, "God loves you but that's not enough" (meaning, I suppose, that one still has to be "saved" – but nevertheless it sounded as if they felt that God's love was inadequate somehow!). Evidently, some of the church's parishioners must have been disturbed by it as well, because a couple of days later the "but" and the "not" had been removed from the message!