#10 Bret Hart
One of the most controversial exits from WWE history was that of former WWE Champion and icon Bret Hart, who quit the company in 1997 and joined WCW.
Most wrestling fans know of the Montreal Screwjob, where Hart lost to Shawn Michaels for the WWF World Heavyweight Championship, which was his final match in WWE, in his home country of Canada.
Hart had already signed a deal with WCW as WWE could no longer afford Hart's contract. Although Bret Hart was willing to lose the title to Shawn Michaels, he did not want to lose in front of his home fans at the Survivor Series PPV in 1997.
Hart eventually moved to WCW and went on to win numerous titles, before burying the hatchet with Vince McMahon and WWE, and returning in 2005 before being inducted into the WWE Hall of Fame twice.