The Greek Myths Puns

So my younger brother was talking about his Latin class and how on Fridays his teacher has culture friday, or a lesson on Greek Mythology. He was talking about the myth he learned about last week when my dad replied with this...

Brother: "Last week we learned about syphilis and how he pushes the rock up the hill again and again."

Dad: "I think you mean sisyphus, syphilis was a Greek god but he was a real dick."

I laughed, my mom groaned, and my brother sat there confused. A successful family dinner if you ask me.