Charlie Sheen invoked Allen Iverson's famous "We talkin' about practice" press conference during his interview on the "Today" show this morning. The troubled actor was answering a question about whether he had ever missed a day of work on "Two And A Half Men," which is inexplicably a hit series. Sheen replied that he had never missed a day that cost anybody any money. "I missed practice. To quote the great Allen Iverson, 'we talkin' about practice'," said Sheen.