I remember Roy Caroll being about 500ft behind the goal line, behind the stands and in the car park at Old Trafford when he pushed the ball back out of the goal for Man Utd.
Reading v Watford (I think) about 10 years ago had a ghost goal given when the ball went over the line... but it was the wrong side of the post.
Goal-line technology is absolutely required as the human eye is shit at getting these decisions right. Until yesterday, Hawkeye had done it's job correctly 100% of the time since it had been implemented. I'd take one Hawkeye mistake in several years over trusting the human eye, any day of the week.
This message has been brought to you by 'SkyNet': "We're not trying to overthrow you".