Not from my own stock, Google's jewish jokes site :
A Priest and a Rabbi are riding in a plane. After a while, the Priest turns to the Rabbi and asks, "Is it still a requirement of your faith that you not eat pork?"
The Rabbi responds, "Yes, that is still one of our beliefs."
The Priest then asks, "Have you ever eaten pork?"
To which the Rabbi replies, "Yes, on one occasion I did succumb to temptation and tasted pork."
The Priest nodded in understanding and went on with his reading. A while later, the Rabbi spoke up and asked the Priest, "Father, is it still a requirement of your church that you remain celibate?"
The Priest replied, "Yes, that is still very much a part of our faith."
The Rabbi then asked him, "Father, have you ever fallen to the temptations of the flesh?"
The Priest replied, "Yes Rabbi, on one occasion I was weak and broke with my faith."
The Rabbi nodded understandingly for a moment and then said, "A lot better than pork isn't it?"