http://en.wikipedia.org/wiki/Brett_Favre#Green_Bay_Packers_.281992.E2.80.932007.29
On March 4, 2008, Favre formally announced his retirement.[56][57][58] Although Favre stated that he had been willing to play another year, he felt that another season would only be successful if he led his team to another Super Bowl victory. He added the chances for a Super Bowl win are small, and that he wasn't up for the challenge. At his press conference, Favre openly wept about leaving the NFL. He stated that his decision, regardless of what was being said in the media, had nothing to do with what the Packers did or didn't do. He said, seemingly contradictory to Cook's statements, that his decision to retire was based on the fact that he didn't want to play anymore. He said during the conference, "I know I can play, but I don't think I want to. And that's really what it comes down to."[58]
On July 2, 2008, it was reported that Favre was in contact with the Packers about a possible return to the team.[59] On July 11, 2008, Favre sent a letter to the Packers asking for his unconditional release to allow him to play for another NFL team.[60] Packers general manager Ted Thompson announced he would not grant Favre an unconditional release[61] and reaffirmed the organization's commitment to Aaron Rodgers as its new quarterback.[62] Complicating matters is Favre's unique contract giving him the leverage to void any potential trade by not reporting to the camp of the team he might be traded to if the Packers elect to go that route.[63]
Favre spoke publicly for the first time about his potential comeback in a July 14, 2008, interview with Greta Van Susteren on the Fox News Channel's On the Record with Greta Van Susteren. In the interview, Favre said he was "guilty of retiring early," that he was "never fully committed" to retirement, and that he was pressured by the Packers to make a decision before the NFL Draft and the start of the free agent signing period.[64] Favre disputed the notion that he doesn't want to play for Green Bay and said that while he understands the organization has decided to move on, they should now allow him to do the same. He made clear that he would not return to the Packers as a backup and reiterated his desire to be released rather than traded, which would allow him the freedom to play for a competitive team. Favre also accused the Packers of being dishonest, wishing the team would have been straightforward with him and the public.[65]
That first part, sure seems like what I said was true, Kev... "Although Favre stated that he had been willing to play another year, he felt that another season would only be successful if he led his team to another Super Bowl victory. He added the chances for a Super Bowl win are small, and that he wasn't up for the challenge."
In other words, he said, screw GB, I want to play for a team that WILL win next year, can anyone say Hossa from Penguins 2 years ago? playing for Detroit last year, look where that went, he lost to his old team in the Stanley Cup, I was ROFL'ing.