I tried to find the old threat...I hope this one hasn't been posted before:
Four nuns are standing in line at the gates of heaven. St. Peter asks the first if she's ever sinned.
"Well", she admits, "I once saw a man's penis."
"Put some of this holy water on your eyes and you may enter heaven", he tells her. Peter then asks the second nun if she's ever sinned.
"Well", she replies, "I once held a man's penis."
"Put your hand in this holy water and you may enter heaven", he says.
Suddenly, the fourth nun rushes past the third to get in the front of the line. "What's the hurry?," St. Peter asks.
The nun answers, "I want to gargle the holy water before she sits in it!"