Interesting scrap note with a Bones quote

I'm de-cluttering. Today I went trough some of my long forgotten scraps of paper that I pile up in a box on my desk. One of them read: "Is that a cartoon rendering of a penis in your book? Why is it talking?". I left me puzzled. Funny, but it's been so long that I couldn't remember where it was from....

It was from Bones:

"Is that a cartoon rendering of a penis in your book?"
"Uh… why, I guess it is. Look at that."
"Why is it talking?"

(S05E03 The Plain in the Prodigy)