Using Bitcoin QT.
When I first got the client, I created an address label for an address of 1 suspected thief's wallet. I was hoping to send him a pity msg along with a fraction to see if they would donate some (if it was indeed them).
After a while I forgot that's what I wanted to do.
When I finally figured out how I could buy some BTC with an Australian card through Quickbit, I was obviously excited and dumb.
Essentially I have sent 0.1 BTC to someone who may or may not be a thief.
I have contacted Quickbit to ask them if they can sent a fraction to them to explain the error in the hopes they may send it back.
I'm well aware my chances of getting anything back are very slim. Live and learn.
Time to try and buy some Quark off Ebay...