this story’s actually a couple week’s old, but it’s the first time i ran across it:
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“MAN DATES GAL ON INTERNET FOR SIX MONTHS — AND IT TURNS OUT SHE’S HIS MOTHER!
Friday December 9, 2005

MARSEILLES, France — Skirt-chasing playboy Daniel Anceneaux spent weeks talking with a sensual woman on the Internet before arranging a romantic rendezvous at a remote beach — and discovering that his on-line sweetie of six months was his own mother!
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full story:
http://entertainment.tv.yahoo.com/news/wwn/20051209/113414040002.html