This joke may not be the best, but it was told one night to me by one of the Beatles on the way to dinner:
"Why dont Italians like Jehovahs Witnesses? - Italians dont like any witnesess......"
There were 3 others with us that night, 2 of whom were Italian and one of them knew I was a JW! I laughed loudest......
Cheers, Mattieu