This story of mistaken identity after a car crash is absolutely one of the craziest~and scariest~things I've ever heard of!
I've always heard stories or watched t.v. shows where family members are told that it's better not to view the body of a loved one who has died if they've been in an accident or something and I've always thought that I would probably want to look anyway. I think I'd need that closure but then I've also wondered if it would haunt me too much if the body was too injured. After reading this story, I think I would have to see...just for my peace of mind.
If you're interested in reading more than just the above link, there are lots of related articles that you can get to from that original article.