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Infamous character from the cult game [i][[Yume Nikki]][/i]. [spoiler]If you turn off the light in [[Poniko]]'s Room, there is a very small possibility that Poniko will be replaced with Uboa, and simultaneously trapping the player within the room.[/spoiler]
A continuous filtered "aaaaaaah" sound plays with its appearance.

Should you interact with Uboa, you will be teleported to a "hellish, looping world":http://static1.wikia.nocookie.net/__cb20100312175558/yumenikki/images/3/38/Uboaspace.jpg, where the only way to escape is either using the Medamaude "effect" to return to the Nexus, or to pinch yourself awake. 
ウボァ