Have you ever accidentally send Bitcoin to the wrong person? Or sent the wrong amount?
I did. Like a fool. Last night I was playing around with it and falling asleep at the same time.
I tried to upload 17 bitcoins to Mt.Gox... but I went to my addressbook and saw one unlabeled address. Thinking, oh that must be the new address just created, I'll use that one... I sent it to that address. Of course, instantly I remembered that it creates new addressed when RECEIVING money, not when sending it. Duhhh. I went back to Mt.Gox and it just has a box to enter the amount. Only AFTER you submit that, then it tells you the address to send it to.
Oh well. One of my contacts received a surprise of 17 BTN last night. Paying it forward.
What would I do if it had been 170,000 BTN....?

I might not be so happy letting it go then....
PS - Is the proper abbreviation BTN or BTC or BCN? I can never remember.
This is just my experience, I've never experienced it, but I've seen on Blockchain transactions, that there is someone who does foolishness when it costs the delivery of Bitcoin, whether he's sleepy or drinking mostly alcohol, that he's wrong when setting costs, and he's setting shipping costs of 50 BTC, and he even sent Bitcoin a little bit like sending a shipping fee ..