a couple of summers ago i saw a sedan outside of a car lot and it said something silly like $280 (give or take $$$). we stopped and asked what was wrong. the guy says it has a knock but it drives. previous owner drove it to the lot and they had been driving it around the lot to move it from here to there until it sold. oh yea, he also said the oil light was on. we wanted to hear this "knock" so we got the key and turned it over. holy mother of all that is good.....it was the loudest horrific sound. immediately shut it down. bought the car anyway as we had a replacement engine sitting around.we yank the bad engine and find this:
some people would say "oh well, it was a bad engine anyways"....others would probably freak out.