That is from the GPF held in Korea. Was it 2008? Anyway, they are very cute.
And I'm pretty much sure that headless guy is Kozuka.
yeah you're right! it was at the 2008 GP finals in Korea
Yuna was imitating Mao's shoulder wiggling which she did in her Czardas FS here-
http://www.youtube.com/watch?v=W5G3Ns2i86U @ ~1:50