A middle-aged Jewish man goes to his rabbi and says, "Rabbi, you gotta help me. It's my son. For 30 years he's a Jew, and now bam! He says he's a Christian!"
"Funny you should say that," the Rabbi replies. "I'm having the same problem with my kid. Let's go see Rabbi Rabinowitz, the Elder.
So they go see Rabbi Rabinowitz. "Both of our sons say they're Christians now," says the younger Rabbi.
"Funny you should say that," the elder Rabbi says. "My son, too! 30 years of being a Jew, and now BAM! Let's go see Rabbi Spiegel, the eldest of all of us."
So the three go see Rabbi Spiegel. "Rabbi, all of our sons are going around saying they're Christians!" the men complain.
"Funny you should say that," says Rabbi Spiegel. "My son, 30 years he's a Jew, and then bam! He's a Christian now." The rabbi gets serious. "The only thing we can do is take this straight to Jehovah." And the Rabbi kneels and prays, "Oh, mighty God, our sons have been good Jews for 30 years now, but now they're going around saying they're Christians!"
And a voice booms down from heaven: "Funny you should say that..."