Geof Hurst (right)
The first goal-line incident that comes to mind is of course the shot of Geof Hurst that hit the underside of the crossbar and bounced down on or behind the goal-line in the 1966 World Cup final. England won in extra time also due to this controversial goal with 4-2 against Germany. Modern technology suggests the ball didn’t pass the goal-line and even Hurst himself admitted it didn’t. Maybe hawk-eye can be the permanent solution. Check the video of the incident:
[...] is outdated before it comes to use. Hawkeye has more options. To prevent goal-line incidents (see here, here or here) it makes a three dimensional image of the situation around the goalpost and can [...]