It was certainly wishful thinking and being positive that led to this contestants wrong answer.

The New England Patriots won their 5th (FIFTH) Super Bowl this past February but the guy who was a contestant on a recent Wheel of Fortune decided he wanted to solve the puzzle at this very point in the game.  Well, he said SIXTH instead of FIFTH, incorrectly answering the phrase.  We like his thought process though don't we :)

The episode was posted on Youtube so you can see and hear it for yourself.