3 monks die around the same time and go to heaven. At Pearly Gates, Peter tells them "You 3 have been very good people throughout your life. For this reason each of you may do one sin and come back."
They all go away and come back in some time. "What did you do?" Peter asks the first monk. "I mugged an old woman" the monk replies. Then Peter says "Congratulations! You may now drink from the Holy Pool!"
Peter asks the second monk what he did. "I drank some alcohol" replies the monk. Then Peter says "Spendid! You may now drink from the Holy Pool!"
Finally, Peter asks the third monk what he did. The monk sheepishly answers "I pissed in the Holy Pool."
Peter then says "Marvellous! You may now drink from the Holy Pool!"