Best/Worst Double Turns In Wrestling?

What do you think was the best and worst double turns in wrestling?  My personal picks;
-Best;  Steve Austin vs Bret Hart in a submission match at Wrestle-Mania 13 in 1997.  I really don't think I have to explain why.  
-Worst;  Ric Flair vs Hulk Hogan for the WCW Championship in a steel cage at Uncensored 1999.  Nobody was clamoring to cheer Hogan and boo Flair at that point.  
Sure.  Have their been a bunch of other ones?  I don't really think it's common enough to where I can make a list or anything.