2011-09-24
Explanation
This is a single-panel comic featuring a doctor (identifiable by the head mirror) who says: "Oh! I don't know why this just popped into my head, but do you wanna see pictures of my trip to the Grand Canyon?" Below the panel, the caption reads: "I need to find a new gynecologist."
The joke relies on the reader inferring the medical context from the caption. The doctor is a gynecologist, meaning the patient is in a vulnerable position during an intimate examination. The doctor's comment about the Grand Canyon "just popping into his head" is a double entendre -- the Grand Canyon is a famously large, deep natural formation, and the doctor is making an unintentional (or perhaps intentional) association between what he is currently looking at and a geographical landmark. The humor comes from the inappropriate timing and the oblivious or tactless nature of the remark, which understandably makes the patient want to find a new doctor.
The votey panel shows the patient saying "Whoa. One sec. Vertigo." This extends the Grand Canyon metaphor further, with the patient playing along with the visual comparison by pretending to experience vertigo -- the dizziness one might feel when looking into a vast chasm -- adding another layer to the anatomical joke.