While I was on the range one day, a jr. golfer getting abused by his father (a 15+ hdcp..). After every shot, he would give ranting instruction to the point where it was embarassing me. Talking about angles, swing plane, wrist and hip position...

I knew them both well, and, when i asked the dad about his golfing abilities, he said my favorite line from the archive of high handicap tip giving - "I know the golfswing, but i can't make myself do it."
Then i said, "So your basically a vegetarian telling your kid how to cook a steak?"
