How do you not know the rules?

Sports
1

LPGA pro disqualified from AIG Women’s British Open after caddie uses rangefinder (msn.com)

She was DQ’d because her caddy used a range finder.
They are now legal in most PGA events, but some still don’t let you use them.
How the hell do you not know the specific rules of a Major Tournament?

2

Remember this example of not knowing the rules, from an earlier thread:

3

I forgot I could only be an ass three times instead of four.
I actually like McEnroe, but he as a dick at times.