The mechanic says, "I'm terribly sorry, Father. Come back in an hour and we'll have it fixed right up for you."

An hour later the priest returns and the mechanic says, "All set, Father. I found the problem. It was a loose oil filter, and it won't be leaking again because I screwed it in a tight as a nun's pussy."

The priest looks at the mechanic and says, "Better give it another quarter turn."