I just wondering , how can this type of mistake possible? I think fee are automatically being charged right. This is such huge huge mistake ever , I can't even imagine if that was me. Pheww. Looking at current btc price and 15 btc as fee. I'm going to shop and buy myself a rope. LoL !
Yeah I'm having the same thought, this has happened a long time ago, at least it's enough for bitcoin's price to go sky high, and I can't even imagine how much 15 bitcoin is right now. I mean if I ever made such mistake, it would strike me down and I think I wouldn't live for long 
Anyways I have a deep sorrow for that man, it must have been a difficult time for him to gain back what've lost.