Sam goes into Macy's, to the lingerie department, and he says to the salesgirl, "My wife has sent me in for a Jewish bra, size 34B, and she said that you'd know what I meant."
The saleslady says, "Boy, it's been a long time since anybody's asked me for a Jewish bra. They usually ask me for a Catholic bra or a Salvation Army bra or a Presbyterian bra."
He says, "Well, what's the difference?"
"Well," she explains, "the Catholic bra supports the masses, the Salvation Army bra uplifts the downfallen, and the Presbyterian bra keeps them staunch and upright."
He goes, "Well, then what's a Jewish bra?"
"Oh, a Jewish bra makes mountains out of molehills."