One time I came out of Home Depot and saw a guy tying some molding onto the roof of his car. It was an expensive car too. I put the stuff in my saddlebags and said, "That's not going to hold," pointing to where he tied it to the windshield wiper. He told me he knew what he was doing, which I disagreed with, seeing as how I was a licensed general contractor. I shrugged and went back to my own stuff as he pulled out. About two hundred feet up the main road, he was on the side of the road with his windshield wiper bent up, and nearly ripped off the car. I slowed down as I passed him and said, "I told you it wasn't going to work."
People who think they know everything are very annoying to those of us who do.
