The actual joke was going to be that the first time Fran forgets to flush, Naga freaks out that Fran’s shit doesn’t look like hers, thinking Fran must be seriously sick or something. At the time I wrote it I though snake poop looked like bird poop, but turns out their shit looks pretty similar to basic mammal shit. So the whole joke was fail, and I had to cut it and extend the masturbate scene an extra panel instead.