What is the funniest joke you’ve been told that you still think about to this day?

A Jewish son tells his father he is moving out. The son returns a year later and tells his father that he has converted to Christianity. The father is upset and calls his friend who is also Jewish. “You won’t believe this, my son David moved out for a year and came back and told me he converted to Christianity.” His friend says, “you won’t believe this…my son Benjamin moved away for a year and when he came back HE converted to Christianity too”! Both upset, they call their rabbi and explain what happened. The rabbi says, “you won’t believe this, my son Joshua moved away and when HE came back he told me he converted to Christianity too”! The rabbi suggests they call God and tell him. The rabbi tells God that all three men had sons who moved away and converted to Christianity and don’t know what to do. God says to them, “you won’t believe this…