While reading all of the posts in here, I was thinking if it's gonna be refunded but it's such a good news to see that F2Pool is just gonna hold based on the update given by oeleo.
That's really some insane stuff. Hopefully the person has like 1000s of btc and can live with the error. This type of mistake can break a person and ruin his/her life forever otherwise.
I think it's a rare case and usually people that make a mistake like this aren't really people but the exchanges or some huge services that's been operating related. But for real if this is like just an individual person and does this mistake, something may come terribly to his mind and we don't know what's gonna be the end of that story.