Thanks to my cousin for this one

After twenty years of shaving himself every morning, a man in a small town decided he had had enough. He told his wife that he intended to let the local barber shave him each day. He put on his hat and coat and went to the barber shop, which was owned by Pastor O'Loan of the town's Baptist Church.

The pastor's wife, Grace, was working that day, so she performed the task. Grace shaved him and sprayed him with lilac water, and said, "That will be £40." The man thought the price was a bit high, but he paid the bill and went to work.

The next morning the man looked in the mirror, and his face was as smooth as it had been when he left the barber shop the day before. Not bad, he thought. At least I don't need to get a shave every day. The next morning, the man's face was still smooth. Two weeks later, the man was still unable to find any trace of whiskers on his face.

It was more than he could take, so he returned to the barber shop. "I thought £40 was high for a shave", he told the pastor's wife, "But you must have done a great job. It's been two weeks and my whiskers still haven't started growing back."

Expecting his comment, the expression on her face didn't even change.

She responded, "You were shaved by Grace O'Loan. Once shaved, always shaved."