Shel Silverstein [0] has been on my bookshelf. I enjoyed reading Falling Up [1] as a way to help my kids understand that poetry is more than rhyming.

From The Little Boy And the Old Man [2]:

Said the little boy, "Sometimes I drop my spoon."

Said the old man, "I do that too."

The little boy whispered, "I wet my pants."

"I do that too," laughed the little old man.

Said the little boy, "I often cry."

The old man nodded, "So do I."

"But worst of all," said the boy, "it seems Grown-ups don't pay attention to me."

And he felt the warmth of a wrinkled old hand. "I know what you mean," said the little old man.

[0] http://www.shelsilverstein.com/

[1] http://www.shelsilverstein.com/books/falling/

[2] http://www.poetrysoup.com/famous/poems/best/shel_silverstein