True story regarding the Cha-Cha Slide one: My best friend in 8th grade, who went to a different school than I did, mentioned that at one of her school dances ("sock hops" they were called...hurrrr), she overheard one of her classmates complain that he couldn't dance the Cha-Cha Slide.
True story regarding Bishoujo Senshi Sailor Rukifellth: I managed to get my hands on a clip of Rukifellth's VA, Shou Hayami, singing "Moonlight Densetsu" by Dali, which for the unchurched is an opening theme for the Sailor Moon anime, and whose instrumental and lyrical melody was used for the English Sailor Moon theme. It was pretty loltastic, even though Shou Hayami's actually not that bad of a singer. Although I guess that makes it even more loltastic...
(Incidentally, Shou also voices the Angel of Light and Shadow, but...)