Also, from the 1992 60 Minutes interview:
Sitting with correspondent Steve Kroft, Allen discussed the bitter custody battle that was at play with his ex-partner Mia Farrow at the time. In 1992, Farrow learned of Allen's relationship with Soon-Yi Previn, the Rosemary Baby star's adopted daughter with Andre Previn. The New York City resident told Kroft he feared for his life and even shared one not-so-happy holiday card that truly made him believe Farrow was out to get him.
"She sent me a Valentine card," the director said, stuttering in recollection. "She didn't send it to me; she gave it to me. And I said, 'Oh, thanks,' you know. And I went downstairs, I got into my car and I opened it up, and there...was a very, very, very chilling Valentine, meticulously worked on."
"One hesitates to say psychotically worked on," he reasoned. The card, he explained, was "a Victorian Valentine and photo of the family, and through all the kids was thrust needles and a steak knife stuck through the heart of the thing."