Three priests -- a Dominican, a Franciscan and a Jesuit -- walk into a bar.
According to the Rev. James Martin, its not only the opening to a good joke, but quite possibly the saving grace of religion.
Martin's new book, "Between Heaven and Mirth: Why Joy, Humor and Laughter Are at the Heart of the Spiritual Life," says religious people would be a lot happier -- and holier -- if they lightened up and took themselves less seriously.
"Joy, as a number of spiritual writers have said, is the surest sign of the Holy Spirit," the Jesuit priest said at a recent gig at Georgetown University. But, he continued, "there are certain Roman Catholics who seem to think that being religious means being deadly serious all the time."
Although Martin, the culture editor of the Jesuit magazine America and the unofficial chaplain to Comedy Central's "The Colbert Report," uses his Catholic faith most frequently in his examples, his argument extends to other faiths, he said.
Martin said humor -- especially self-deprecating humor -- is "essential for interfaith dialogue" because it relaxes the discussion.
"It humanizes you, and it also reminds people that ... you take your faith seriously, but you don't take yourself too seriously," he said.
Of course, Martin admitted, there are certain lines that cannot be crossed when using humor around religious matters. He'd never tell a joke "making fun of certain people, making fun of certain Catholic beliefs, denigrating people, anything that's ad hominem."