A mother superior called 3 nuns and asked them to do a sin or something wrong...

The nuns were hesitant because they didn't want to, but the superior said it would be a lesson in confession.

Then a little later, one came back and was crying

"Why? What did you do?" asked the mother superior

"I picked flowers in the garden."

"Ok your sins are forgiven, go drink the holy water."

The nun did as told, then another nun came, she was also crying

"Why? What did you do?"

"I stole a candy from a kid"

"Ok your sins are forgiven, go drink the holy water."

She also did as told...

Then the last nun came, but she was roaring with laughter

"Why? What did you do?" asked the mother superior sternly

"I peed in the holy water!"