Clean can be funny.
A Polish immigrant went to the DMV to apply for a driver's license. First, of course, he had to take an eye sight test The optician showed him a card with the letters 'C Z W I X N O S T A C Z.' 'Can you read this?' the optician asked. 'Read it?' the Polish guy replied, 'I know the guy.'
Mother Superior called all the nuns together and said to them, 'I must tell you all something. We have a case of gonorrhea in the convent.' 'Thank God,' said an elderly nun at the back. 'I'm so tired of chardonnay".