On April 1st, 2004 users started receiving blue giftboxes (previously only rumored to exist), in what appeared to be normal random events. When the box was opened the avatar's face became burnt, and would remain so until it was resaved after the day ended. However, there was a glitch with it: If you had not yet created your avatar, and had the default shadow form when you opened the box, you would get the effect seen above.
Until recently, InvisiBobs could still be seen floating around every so often by the lucky user. Unfortunately, when Gaia came out with the new Avatar System in 2006 (?), many glitched avatars were wiped from the system, amid the protests of some disgruntled users.