From my BBG post:
The face displayed on the 3GS screen is actually that of Hatsune Miku, the anime girl depiction of a vocaloid software created by Yamaha that continues to be a huge hit among Japanese web geeks. The music she’s singing is Levan Polkka, a Finnish folk song. Videos of Hatsune Miku singing Levan Polkka became a huge meme on the web video site Nico Nico Douga, which I wrote an article about in Wired Magazine last year. The scallion-twirling, someone explained to me, is a symbol of dumbness — only a really brainless person would stand there and twirl scallions all day.