'Gridanian Roots' acceptance text

[Anonymoose]

EDIT: Disregard this; the joke went right over my head. I'll turn in my 'good catch' gold card immediately.

Original Post QFT:

When giving the introduction speech to 'Gridanian Roots,' the Rank 20 Botanist Quest, a text-box appears asking you to accept or deny the quest. It reads:

Join the Botanists' Guild?
Yes, I will answer the call of nature!
No, I must answer the call of nature.

Is the refusal supposed to read this way? Or, perhaps:

No, I musn't answer the call of nature.
Or, maybe:
No, I must answer the call of nature alone.

It seems very strange to me.