Well, obviously that's since changed, but back in the day Woody Allen had absolutely no clue who Scarlett Johansson was. Now she's his muse, but it all started by accident.

Woody said,

"Yeah, Scarlett was an accident," he says. He had hired Kate Winslet for Match Point but she dropped out at the last minute.
"I didn't know Scarlett from a hole in the wall," Allen admits. But he
was in a bind. "I hired her and became totally captivated by her," says
Allen.

Now, like with past muses before her, Woody uses Scarlett for every movie he can.

"Whenever there is a part that fits, I would always call her
(Scarlett), as I did with Keaton for years," he says. "I did that with
Mia [Farrow]. And she never let me down. I think the same would be true
with Scarlett."

Can you imagine if Kate Winslet had taken the role in Match Point...then we'd probably have Kate in Lost in Translation and everything else Scarlett has done in the past couple of years.