Mark Cuban is expected to testify Thursday in the government's insider trading lawsuit against him, which could come down to whether jurors believe the billionaire and Dallas Mavericks owner's account of a 2004 phone call.
Cuban is likely to say that he never promised to refrain from selling his shares in an Internet company after learning news that would cause their value to fall.
The CEO of the Canadian search-engine company says Cuban agreed at the start of the phone call that he would be learning confidential information. When Cuban learned about Mamma.com's plan to issue more stock—lowering the value of Cuban's 6 percent stake—he got angry.
"Now I'm screwed. I can't sell," Cuban said, according to Guy Faure, whose testimony was recorded in late 2011 and played Wednesday for the jury in U.S. district court in Dallas.