Kamen no Maid Guy: Boyoyon no Battle Royale (Masquerade Maid Guy: Bouncing Battle Royale) is a sort of horribly voice acted minigame-fest with Smash Bros. elements for PSP (gameplay video here, more videos here). It looks rather uninteresting, aside from the rather dynamic if typical music. But what's curious about it is here, on the System page. The maker, AC Gateway and Gadgetsoft, is touting what it calls the Super Tayunizm Engine. This is basically an "engine" for making boobs bounce. They have a 2D version here, and a slightly more disturbing SD 3D one here with bonus disturbing panty shot. The basic premise is that even in 2D, as motion gets more extreme, so too does the bouncing, and dynamically so. The videos are even annotated. So there you go.