And everyone can jump over it.
A few years ago, Pam Shriver announced the result of a study that had been done on the accuracy of line officials. They were correct 70% of the time. Just as I was thinking "that's even worse than I thought," Shriver told us all how great it was.
A while ago, an announcement was made that at the 2014 Australian Open, the officials have been correct 70% of the time in the women's matches, and 75% of the time in the men's. Then ESPN commentators told us something special must be going on for the line officials to be that good.
What if I "got it right" 70% of the time in my job? I would be searching everywhere, for either another job, or a way to correct my apparently errant ways. If your job is to call the lines, then 70% (or even 75%) accuracy isn't good at all. But ESPN says it's great, so you know, it must be great.