We have two runways in an X pattern. A few years ago I'm just sitting there on one of the benches watching as one of or long time and better pilots is coming in on final. He's got it lined up real sweet and just about to cross the threshold when out of the corner of my eye I see someone else landing downwind. I figured the guy landing in the correct pattern knew what he was doing so I shouted at him THROTTLE UP AND GET THE H%&* OUT OF THERE! YOU'VE GOT ONE COMING IN FROM THE WRONG DIRECTION! Very calmly he replied "thank you" and went around again. LOL! When the other guy lands and was informed of his error he said "Oh, gee, did I do that again? Hahahahaha!"