Consider the following scenario:
Ancient Egyptian Peasant: Dude, my eye hurts like Set's asshole!
Other Ancient Egyptian Peasant: Don't you mean like Horus's eye? That Set poked out. That we draw on everything. And that will rank in the top 10 unoriginal tattoos.
Peasant 1: Shut up, asshole sounds funnier.
Peasant 2: whatevs
Priest/Healer: hey, your eye hurts? I can fix that! Let me smear some of this on it.
Peasant 1: Um, is that poop?
Priest: No! Don't be ridiculous! It's poop and mucous and some straw.
Peasant 1: Hey, what do you know? My eye is totally better! I need to, um, go do some stonecarving. Bye!