alt Hacker NewsI managed to register a one letter domain below a CC-tld, despite that country having a rule against it. Their signup form had two stages and the check was only on the first page... so all it took was changing a hidden form field.
I had it for a while until they started charging a lot for it (it was Turkmenistan).
I managed to grab a lot of really good[0] emoji domains by bouncing between registrars until you find one that has some poor (good?) coding that lets them slip through.
Then you get stuck a year later when they've upgraded their system and now nothing you do will let you renew it or transfer it...!
[0] "good" is subjective in this context