I swear I did not damage them

We were sauntering along to school. S clinging to my left hand and A trying to dislocate my right by skipping without regard to how the humerus is joined to the scapula by a membrane and some ligaments.

I don't recall exactly why we started singing a medley of songs from "The Wizard of Oz"; that 1939 classic with Judy Garland. We covered the gamut and they were singing so enthusiastically that I did not have the heart to rebuke them even as they were caroling while crossing the road. (I usually tell them to focus on the roads and possible dangers, so they are not to hold conversations, nor play while attempting a crossing.)

Then I asked them what each character wanted from the Wizard. They promptly rattled off the appropriate answers. And then I asked them what they would like to ask from the Wizard if they ever found the Emerald City. This is where is gets strange.

A: I want a caterpillar!
S: I want a cat!

Why?

A: So that the caterpillar can eat leaves.
S: So that the cat can sing.

Huh? No further clarifications could be goaded out from their mysterious minds.

Anything else?

S: I want to be a rubbish bin! (With so much glee that I was feeling a little disturbed.)
A: I want to be a BABA. (Their names for the Minions.)

I decided right then to steer the conversation elsewhere. I really liked singing along with them though.