Watching Tom Brady and Tim Tebow play quarterback is like watching two players play two completely different positions. Brady has the deadly accurate arm, while Tebow can be erratic and inaccurate. Tebow is fleet of foot and daring as a runner, while Brady runs as if he hopes no one is watching him. Brady is a defense's worst nightmare on 3rd-and-10, Tebow is the same on 3rd-and-2.
But these two quarterbacks share a trait, and it's the most important for a player at that position to have: when the game is at its most tense, most difficult and most critical stages, they get better, almost every time.
Call it competitiveness, call it intangibles, call it whatever you want. It's that quality that has made opposing coaches fear the combination of Brady, the ball and the final few minutes, and it's making them feel the same way about Tebow.
It's a quality possessed by plenty of other players as well. These are the players that are bigger than any stage they play on, that have their most fun when their team's fans are chomping away at their fingernails.
Simply put, if it's crunch time or a big game and your team's hopes are riding on these players, you're feeling pretty good about your chances.