A few years ago, when I only started using Bitcoin, I've lost a small amount when I sent bitcoins to a wrong address.
I think it's not lose big,this may be a small thing but a lesson for us all,to see the wallet again send,because a little mistake will be worse in the end,missing something though a small but worthwhile.you are still lucky people to lose a lot for playing gambling,ponzi games and scam mining sites.