Turns out this was in a Red Dwarf episode. So I’m not original but at least I’m in good company.
Maybe I could use the same drawing with a different caption?
“Of course I know what I’m doing. Now open wide, Margret.”
“No, really, this is a standard treatment for acne.”
“You’d be surprised what a shot of ethylene glycol directly into the pancreas can do.”
“Well, no, I’ve never done exactly this procedure before.”
“I have a bigger one if you’d prefer.”
“Don’t worry. The utility of the neocortex is wildly overstated.”
“Now what do they say? ‘In through the nose and out through the mouth’?”