After years of allowing goals that never actually crossed the line, FIFA finally decided to add goal-line technology to the 2014 World Cup and in the fourth game, it was put to great use.
In the second half of the Chile-Australia game, Aussie Alex Wilkenson cleared the ball of the goal just in time when a Chilean player was able to get it by the goalie:
Screengrab from ESPN
The ball came so close though, that a quick look could have called this a goal. The refs were able to use the new goal-line technology however, to prove that Wilkenson made an incredible save. Pretty cool:
Screengrab from ESPN