This is a totally stupid Catholic joke, but..
Some nuns are in line at the Pearly Gates to get into Heaven.
St.Peter asks the 1st nun, "Have you ever touched a penis?"
She says, "Well, yeah, with the tip of my finger once, I did touch a penis."
So St.Peter tells her to dip her finger in the Holy Water, and lets her into Heaven.
Then, the 3rd nun cuts in line, points at the nun in front of her, and says,
"Hey, I'm not gargling with that shit after she dips her ass in it."