Tell us the things that you've either done due to derping or because you were "tired" >.> lol.
-I spent 5 minutes one time trying to figure out why I couldn't deposit 2k gold in the guild bank and then I realized I was at the auction house.
-I tried to send my alt 200 gold and I typed in 200 and hit send only to log on my alt and realize that I sent a mail with subject title 200 and not actually 200 gold.