I have one!
Four nuns die together in a car accident.
They meet St Peter at Heaven's gates, lined in the order they died.
Peter says to Nun 1:
" Tell me your sins, so that you may enter Heaven free of them"
Nun 1: "I have seen a naked man."
Peter: "Repent, wash your eyes in this Holy Water, and enter Heaven, my child"
Nun 1 does as instructed, and Peter now says to Nun 2:
" Tell me your sins, so that you may enter Heaven free of them"
Nun 2: "I have touched a man's private parts."
Peter: "Repent, wash your hands in this Holy Water, and enter Heaven, my child"
Nun 2 does as instructed, and Peter now says to Nun 3:
" Tell me your sins, ..."
"Wait!" says Nun 4. "Let me go first!"
Peter is startled, and answers "Why my child?, there is no hurry, you have all eternity of bliss awaiting you."
Nun 4 answers: "Sure, but I'm not washing my mouth there after she cleans her ass!"