Three rabbis are sitting & chatting, lamenting about the waywardness of their offspring.
The first rabbi says, “Ach, mein eldest, he is such a mystery. I raised him with such care to be a good Jewish boy, but now he has gone & become a Christian.”
The other two rabbis sympathize, & the second one then says, “And my number one, he too has become a Christian. What shall I do?”
After a moment, the third rabbi says, “How can this be? My one & only son, he too has turned Christian.”
As the three rabbis sit commiserating, a bolt of lightning & a roll of thunder rend the air, a tremendous earthquake rumbles the ground, & a solemn & majestic voice comes from out of the cosmos, “Oy vey, you will not believe this, but….”
My source for the joke? A Jewish friend of an Internet acquaintance.