The Lorax/Tear Jerker

There were moments of sadness within The Lorax itself.

"Once-ler: Aww, you missed me. Ted: What? Once-ler: Well, you're already back. Clearly, you missed me. A little.(voice trembles slightly) Right?"
 * From the TV special version, near the end, we hear the song the Once-ler sings to the boy and it brought this troper to near tears.
 * From the film version itself, after the last tree is cut down, Just the entire scene here...it brought tears in my eyes.
 * This exchange, though sarcastic at first, makes you realize just how lonely the Once-ler's been...