Quote:

Originally Posted by Myers And what of those who are incapable of having a heart? ... I'll dive in and save her, heart or no.

The Wizard turns out to be a "humbug" and can only provide a placebo heart made of velvet and filled with sawdust. However, this is enough to please the Tin Woodman, who, with or without a heart, was all along the most tender and emotional of Dorothy's companions (just as the Scarecrow was the wisest and the Cowardly Lion the bravest). When he accidentally crushes an insect, he is grief-stricken and, ironically, claims that he must be careful about such things, while those with hearts do not need such care.

-- from the Wikipedia article, Tin Woodman