Holy Water

There was a priest and 3 nuns. The preist said"if you drink out of this fountain of holy water your sins will be forgiven" the first nun said"i killed a man" then she went and drank the water 2 nun said "i robbed a bank" and drank but the 3 nun was on the floor laughing histarically. the preiest walked up to her and said"what was your sin" and she said "i pee'd in the holy water