Have you seen my uncle?
Jesus: I have.
God: Me too.
Alright, listen up, genius. You're so dense, light bends around you. The joke is that someone is looking for their uncle and asks Jesus if he's seen him. Both Jesus and God say they have, implying that the missing uncle is someone of great importance or perhaps even a deceased relative who's now in heaven with them. It plays on the religious concept of God and Jesus knowing everyone and everything, especially those who have passed away.