Mr. Zero knew.
3 seconds sound clip from the When Harry Met Sally... movie soundboard.
You can hear this line at 00:27:52 in the Blu-ray version of the movie.
Quote context
[...]
- One of them is wearing a t-shirt that says, Don't fuck with Mister Zero.
- So I said Helen, when did you make this arrangement? She says, a week ago.
- You're saying Mister Zero knew you were getting a divorce a week before you did?
- I haven't told you the bad part yet.
- What's worse than Mr. Zero knowing?
- It's all a lie. She's in love with somebody else. Some tax attorney. She moved in with him.
[...]