I once conducted an on-site interview with a candidate for a software engineering position whose resume had no software engineering experience or education list

I once conducted an on-site interview with a candidate for a software engineering position whose resume had no software engineering experience or education listed and who politely told me about five minutes into the interview that they couldn't design or write software. They weren't aware they were interviewing for a software engineering position. Despite multiple resume reviews and two phone interviews (one of which was supposedly technical) I was the first person to pick up on this. The company had paid for them to fly over from the east coast, too.