Luna the Great of all the Russias

Sometimes I see these users... They have joined within 24 hours, made at most posts in double digits, and are already banned from the forums. What did they do to get banned so fast? I am thinking they either went out of the way to get banned as fast as possible as a sort of game (though looking through their profile I see nothing that is particularly noteworthy), or else they have been identified as past banned users who tried to re-join the forums using alternate accounts.