"Let's performance!" promises the whacky Japanese video for the Otamatone iPhone app. The Otamatone, if you remember, was the sperm (or tadpole)-looking musical instrument that you play by pulling its lips down or spreading its cheeks. Sound dirty, yes.

The instrument costs far too much at $36, considering it's the sort of thing you'd play with once and then relegate to a dusty draw, but the iPhone app is only $3. Ok, still too much for something you'd relegate to the "boring apps" folder, but hey—tell me something else that resembles a sperm and adjusts its tone when you tilt it vertically? [iTunes via TokyoMango via JapanTrends via OhGizmo]